fix(merc): prevent virtualenvwrapper error at loading
chore(clean): remove useless/redundant lines
feat(tmux,grunt): add a Grunt env shortcut

Create a 3 pane layout and run 'grunt serve' on the first one.
The binding must be invoked in a directory with a Gruntfile.js
fix(tmux): increase history limit to 100,000
fix(tmux): set aggressive resizing
feat(tmux): improve pane management (indexing,kill)

* Indexing start at 1 to map keyboard
* killing a pane is done by pressing PREFIX+q (no confirm)
refactor(tmux): set vim-like binding for copy/paste
refactor(tmux): reduce escape time
feat(tmux): enable session lock with vlock

Terminal session will be locked awaiting the user password to unlock
Read more: http://wroot.org/posts/terminal-auto-lock-with-zsh-and-vlock/
feat(tmux): add mouse toggling binding (m/M)

This allow to use mouse to navigate and still be able to switch to a
select mode.
docs(tmux): add remember to PREFIX+z to zoom panes