[Vim] Use <Tab> for completion and snippets

<Tab> key functionality is chained with following priority:

- Jump to next UltiSnips placeholder
- Expand UltiSnips snippet
- Choose next completion
[Vim] Do not jump on Syntastic error

Thought this might be convenient. Nope.
[Vim] Blacklist YCM file-types
[Vim] Don't fight indent of VimL line continuation
[Vim] Update snippets
[Vim] Use single vimrc augroup
[Emacs] Merge branch 'master' of github.com:noahfrederick/dots

Accepted a GitHub pull request with unpushed local commits.