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Update install

Fix a missing 'exit' statement.
Remove the git installation from 'install'
Install ruby with RVM in the 'install' script
Add a couple of mappings to vim
Adjust vim colorscheme
Merge branch 'master' of github.com:whatyouhide/dotfiles

* 'master' of github.com:whatyouhide/dotfiles:
  Install ruby with RVM in the 'install' script
  Remove the git installation from 'install'
  Update install
Rename ~/.dotfiles to ~/dotfiles

Make also everything more location agnostic by exporting a $DOTFILES
shell variable.
Don't rename windows in tmux
Add the NERDTree plugin back to vim
Add the vim-surround plugin to vim
Make some adjustments with NERDTree + CtrlP in vim
Bind K to kill-session in tmux
Add an npm and a gem modules installer

Run setup/gems to install all the cmdline gems you need, and
npm-global-installs to install the -g npm modules (like grunt or bower).
Add some commonly used aliases to zsh/aliases
Add bundle install/clean mappings to vim
Add a 'tls' alias to list tmux sessions
Specify location of gitconfig without shell vars
Add a startup script for the iTerm+tmux combo

This script checks if there are open tmux sessions: if there are, it
prompts to choose on of the sessions. If there aren't, it creates a
default new session.
Fix some colors in the tmux status bar