Vim: disable paste mode on leaving insert mode

I rarely want to paste more than once, so save myself the hassle of
typing `:set nopaste` once I've done so.

Not sure whether I'll keep this in the long run (it likely depends on
whether I inadvertently enter and exit insert mode before I'm ready to
actually paste).

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Vim: add <leader><leader> shortcut for switching to last buffer

This is a bit easier than either <C-^>/<C-6> or `:b#`.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Vim: turn on spellchecker when editing Git commit messages

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Ack: don't clobber CSS support with SCSS support

The call to `--type-set` was replacing any existing CSS support; let's
instead have our cake and eat it too.

Signed-off-by: Wincent Colaiuta <win@wincent.com>