Fixing try-gmt-python binder dependencies

environment.yml

name: try-gmt-python
channels:
    - conda-forge
    - conda-forge/label/dev
dependencies:
    - gmt=6.0.0a17
    - ipython=7.1.*
    - jupyter=1.0.0
    - notebook=5.7.0
    - numpy=1.15.*
    - packaging=18.0
    - pandas=0.23.*
    - pip=18.*
    - python=3.6
    - xarray=0.10.*
    - pip:
        - https://github.com/GenericMappingTools/gmt-python/archive/0.1a3-123-g2127ad0.zip

first-steps.ipynb

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   "cell_type": "markdown",
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   "source": [
    "# First Steps with GMT/Python\n",
    "\n",
    "\n",
    "This tutorial will get you started with the basic usage of GMT/Python.\n",
    "Some of the examples shown here are from the [GMT Tutorial](http://gmt.soest.hawaii.edu/doc/latest/GMT_Tutorial.html#session-one).\n",
    "\n",
    "## Loading the library\n",
    "\n",
    "The GMT modules are available as functions and classes in the `gmt` Python package. \n",
    "So we'll start by importing it:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import gmt"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Our first map\n",
    "\n",
    "All figure generation in GMT/Python is handled by the `gmt.Figure` class. \n",
    "It has methods to add layers to your figure, like a basemap, coastlines, and data."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "We start a new figure by creating an instance of `gmt.Figure`:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "fig = gmt.Figure()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "We add elements to the figure using its methods. For example, lets add the coastlines of Central America to a 6 inch wide map using the Mercator projection (`M`). Our figure will also have a nice frame with automatic ticks."
   ]
  },
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   "execution_count": null,
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   "source": [
    "fig.coast(region=[-90, -70, 0, 20], projection='M6i', land='chocolate', \n",
    "          frame=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You can see a preview of the figure directly in the [Jupyter notebook](http://jupyter.org) using `fig.show()`."
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "fig.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To open a PDF preview of the figure using your default PDF viewer use:\n",
    "\n",
    "```python\n",
    "fig.show(method='external')\n",
    "```\n",
    "\n",
    "This is useful when using the Python shell or IPython terminal app. \n",
    "However, **this command will not interrupt your Python process**. \n",
    "So using it in a Python script will not work because the script will finish and delete the generated previews.\n",
    "Use `fig.savefig` to save the figure to a file instead (see below).\n",
    "\n",
    "There is also the option of inserting the figure in an **interactive globe** using [NASA's WorldWind Web](https://worldwind.arc.nasa.gov/web/). See option `external='globe'` in the examples below."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## A note for experienced GMT users\n",
    "\n",
    "You'll probably have noticed several things that are different from classic command-line GMT.\n",
    "Many of these changes reflect the new GMT [modern execution mode](http://gmt.soest.hawaii.edu/projects/gmt/wiki/Modernization) that will be part of the future 6.0 release.\n",
    "A few are GMT/Python exclusive (like the long argument names).\n",
    "\n",
    "1. The name of method is `coast` instead of `pscoast`. As a general rule, all `ps*` modules had their `ps` removed. The exceptions are: `psxy == plot`, `psxyz == plot3d`, and `psscale == colorbar`.\n",
    "2. The arguments don't use the GMT 1-letter syntax (R, J, B, etc). Those are still available as aliases and the methods will accept them (see below). \n",
    "3. Arguments like `region` can take lists instead of strings like `1/2/3/4`. You can still use the string form but the list form is easier in Python.\n",
    "4. If a GMT argument has no options (like `-B` instead of `-Baf`), use a `True` value instead. An empty string would also be acceptable.\n",
    "5. There is no output redirecting to a PostScript file. The figure is generated in the background and will only be shown or saved when you ask for it."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "We could have generated the figure above using the classic GMT argument names (but not the module names):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "fig_alias = gmt.Figure()\n",
    "fig_alias.coast(R='-90/-70/0/20', J='M6i', G='gray', S=\"blue\", B=True)\n",
    "fig_alias.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Saving the figure\n",
    "\n",
    "Unlike the GMT command-line interface, **no figure file was generated until you ask for one**.  \n",
    "That means that `fig.show` won't produce a figure file.\n",
    "\n",
    "Use method `fig.savefig` (based on the [matplotlib](https://matplotlib.org/) function) to save your figure:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "fig.savefig('first-steps-central-america.png')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "If you're running a Python script, you can tell `fig.savefig` to open the figure in an external viewer:\n",
    "\n",
    "```python\n",
    "fig.savefig('first-steps-central-america.png', show=True)\n",
    "```"
   ]
  }
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https://mybinder.org/v2/gist/weiji14/f13a7fbde5855bbbeb036c4b1187f675/master
http://binder.pangeo.io/v2/gist/weiji14/f13a7fbde5855bbbeb036c4b1187f675/master