Merge history from all terminals (in screen) right after the command is executed
Don't show basic git operations in history and expand it's size
Alias cd to cdd and add cs

I had problems redefining `cd` because `rvm` changes my `cd` definition
too. See http://stackoverflow.com/a/19941991/1601989. I didn't really
want to use `builtin` because that would skip whatever `rvm` is doing.
Add vim-scala bundle
Change perltidy into a formatprg
Set yaml indent level to 3 spaces
Show tabline at all times
Add scalariform to format scala programs
Change perl's keyword program to podbrowser