A set of steps which can be used to update a pull request based on changes to upstream master branch and to reduce number of commits to a single one.

Git Rebase Commands

# The following assuming that you have both an "origin" and an "upstream" remote created
# If you don't then you will need to configure this.  You can verify what the current state is using
# git remote -v
# Which should look something like the following
# origin git@github.com:rismoney/chocolatey.git (fetch)
# origin git@github.com:rismoney/chocolatey.git (push)
# upstream git@github.com:chocolatey/chocolatey.git (fetch)
# upstream git@github.com:chocolatey/chocolatey.git (push)
# If you don't have this, go ahead and add a new remote using what is detailed here
# https://help.github.com/articles/adding-a-remote

# Switch to your master branch
git checkout master

# Grab the latest code from the upstream repo (in my case, this was a "fast forward", not merge conflicts
git fetch upstream

# rebase the branch based on the upstream master
git rebase upstream/master

# Switch to the Issue branch
git checkout Issue-235

# Grab the latest code from the upstream repo (in my case, this was a "fast forward", not merge conflicts
git fetch upstream

# rebase the branch based on the upstream master - this puts your changes on top of the current HEAD
git rebase upstream/master

# Use the -i flag, to do an interactive rebase, which should open your default text editor, in my case notepad
git rebase -i upstream/master

# You should see a list of all your commits, with the word pick in front.
# Starting with the second commit change the first word from pick to fixup
# Repeat for all subsequent comits
# close editor with save

# Now lets rewrite history
# The following command will again open up your default text editor, with the previous commit message.
# This is an oppurtunity to change it to include the commit messages for the other commits, 
# which are now part of a single commit
git commit --amend

# Push your changes up to the repo
git push -f origin

#Sit back and admire your work