Reenable Powerline
Fixed a bug in powerline where we were constantly creating new date objects. Also sorted the VIM configs.
Update the .zshrc

* Reorder the inclues to the top of the file
* Install fasd
* Change the default screen type
* Add git branch information into the prompt and window title (for tmux)
Improved zsh/tmux configuration

* Tweaked status line and window titling
* Tmux now shows the window title
* Zsh reports the current git branch in the window title
* Lowered history limit
Sorted the vim configurations and added more obvious section headings.