tmuxinator completion

A utility to automate tmux session creation

https://github.com/aziz/tmuxinator
Add Theme "itchy"
Add new theme : jaischeema
Fix the rvm gemset right prompt:wq
Starting tmux plugin with basic config variables.
Adding main function and alias to tmux plugin.
Now checking for 256 color terminal in tmux plugin.
Tmux plugin now just runs tmux if any extra args are given.
Adding comments to tmux plugin.
Enabling autostart of tmux in tmux plugin.
Adding helper tmux config files to tmux plugin.
Fixing typos, logic, and gremlins in tmux plugin.
Checking environment instead of local variable for fixing term in tmux plugin.
Checking if already in tmux before autostarting in tmux in tmux plugin.
Adding option to prevent autostarting tmux more than once in the same session.
Fixing typo in alias.
Adding compdef to maintain tmux completions.
Adding options to choose tmux TERM for 256 and non-256 color terminals.

This may be needed on systems that don't have the proper terminfo for
screen and/or screen-256color. Otherwise the defaults of screen and
screen-256color should be fine.
Checking to make sure tmux is actually installed before running plugin.

If it is not found an error message is printed.
Mercurial: add aliases for 'incoming' and 'outgoing' commands