Unsplit a pane.

un_split_pane.py

import sublime, sublime_plugin

class UnSplitPaneCommand(sublime_plugin.WindowCommand):
    def run(self):
    	if self.window.num_groups() == 2:
        	for view in self.window.views_in_group(1):
        		#TODO check modified?
        		self.window.focus_view(view)
        		self.window.run_command('close_file')

        	self.window.run_command('set_layout',
                            {
                                "cols": [0.0, 1.0, 1.0],
                                "rows": [0.0, 1.0],
                                "cells": [[0, 0, 1, 1]]
                            })