add: ag auto-complete expand-region hightlight-indentation robe smartparens.  remove: rhtml-mode helm, all custom colors
fix hirb/inf-ruby conflict
use packaged yasnippet
switch to modern MELPA yasnippet package
comment out autocomplete; keep it around for reference, for those who want to add it to .emacs_local
Merge branch 'master' into edfork