Fixed `updatepl`

On OS X 10.9 having the `--user` option doesn't allow powerline to
update. Removing this option allows powerline to successfully update.
Added a alias for quickly checking out master
Defined workspace area and quick access to it

Added an export for $HOME/Code and alias `p` that quickly switches to
that location. Feel free to change based on your need.
Merge pull request #2 from lordqwerty/master

Fix powerline update and useful aliases