RVM support, updated exports, aliases, and git
- Add RVM scripts support in $HOME/.rvm/scripts/rvm
- New ARCHFLAGS export that prefers 64-bit
- PATH automatically adds RVM's bin ($HOME/.rvm/bin)
- Add default workon
- Switch default theme back to robbyrussel, but keep lazy prodigy options handy.
- VIM tabstop now defaults at 4 spaces.