remove tabular vim bundle

wasn't using it
use shorthand notation for vim bundles in vimrc
prevent vim from creating swapfiles

vim saves files with a ~ extension as temporary files
in case of a crash. but this is annoying, and i'm not
hugely worried about the risk of losing edits with my
workflow
vim: wildignore settings
vim: clean up vimrc a bit
vim: use Silver Searcher (Ag) instead of Ack
squash into cleanup
squash into dropping Tabular
squash into changes
vim: much simpler CloseOrEmpty behavior
vim: revert to older regex engine for performance
squash into using Silver Searcher
squash into Silver Searcher
vim: disable built-in Ctrl-T functionality
vim: NerdTree behavior tweak
look in wego code directory when we cd
add project-specific binstub to PATH
drop RVM in favor of chruby
add wegotools
drop explicit DYLD_LIBRARY_PATH export

apparently it isn't needed anymore