Sublime Text 3, ST3, cycle group tabs, switch tabs in same group, ctrl-tab in same layout

Installation

0. Install Package Control https://packagecontrol.io/installation
1. Install https://github.com/SublimeText/AAAPackageDev
2. Open command palette (apple-shift-P on OSX), and search for 'Plugin' -> AAAPackageDev: New Plugin
3. paste contents of prev_next_view_in_group.py and save as prev_next_view_in_group.py. 
   AAAPackageDev will automatically select the correct folder
   (which is approximately ~/.../Sublime Text 3/Pacakges/User/)
4. add key bindings to User Key Bindings

ctrl+tab and ctrl+shift+tab will now cycle through your open tabs, 
in order as expected, and won't leave the current layout group.

key bindings

	{ "keys": ["ctrl+tab"], "command": "prev_next_view_in_group", "args":{"dir": 1} },
	{ "keys": ["ctrl+shift+tab"], "command": "prev_next_view_in_group", "args":{"dir": -1} }

prev_next_view_in_group.py

import sublime, sublime_plugin

class PrevNextViewInGroupCommand(sublime_plugin.TextCommand):
    def run(self, edit, dir):
        w = sublime.active_window()
        group_views = w.views_in_group(w.active_group())
        views_count = len(group_views)
 
        curr_view = w.active_view()
        curr_view_index = w.get_view_index(curr_view)[1]
 
        next_view = group_views[(curr_view_index + dir) % views_count]
        w.focus_view(next_view)

This seems to be not required anymore in ST4, as the native behavior now cycles within the same group!