A few updates.

Update ultisnips.
Add vim-snippets.
Update syntastic python checkers.
Change default indentation to spaces.
Don't check in localconfig or googleconfig.
Update .gitignore
Tone down syntastic.

Running all of the C++ checks takes far too long, and pep8 is too
noisy on Google formatted python (2 space indents).
Update snippets and add snippet keybindings.
Improve keybindings.

Make [[ and ]] behave with K&R style.
Make jj be escape in insert mode.
Make gitcommit tw play nice with gerrit.
Add ftplugin/sh.vim.