added Mail and gem/sets

- xcode PeePopen script
- improved gem/shim script
- gem/sets for rbshim script
- mutt configuration (private files are ignored)
improved git-wip

- fix gem/shim script
added Tmux Navigator

- https://gist.github.com/mislav/5189704
added Tmux Navigator

- https://gist.github.com/mislav/5189704
improved zsh configuration

- added rbenv info to theme
- removed vim keys in zsh
- improved git-wip
Extracted vim leader keys to separate file
use correct vim background when inside Tmux session
Using new powerline

- fixed bid() search paths
- improved update()
- vim hard mode (number instead of relativenumber)