vim: Relunctantly, add Powerline config

Never committed the config because I can't really be bothered to
automate all its complex setup requirements for different OSes,
conditional vim config, etc.

Got it set up with the newly rewritten Powerline version, so here it
is, but we'll see if it lasts my next new system install...
bash: Fix RVM status in prompt

See https://github.com/wayneeseguin/rvm/issues/1042
git: push default uses tracked upstream instead of explicit name
vim: Remove old manual Conque install, move to Vundle
vim: Add splitjoin and greplace

Glad to drop the inferior vim-ruby-block-conv.
tmux: Finally add the OS X pasteboard hack
vim: tslime/turbux combo for REPL interaction & out-of-process tests
vim: Screw that, tests get easier mapping. 'F' makes sense for CommandT anyhow