add options_for_select

add method `options_for_select` from Rails.
add rails callbak methods
change abbreviation to c for controller
respect the  convention
Merge pull request #322 from RyanPineo/master

Python: Add Google style docstring support.
Fix spelling throughout UltiSnips/python.snippets
Merge pull request #323 from gfixler/master

Fix spelling throughout UltiSnips/python.snippets
Added Jade templates
Merge pull request #324 from tUrG0n/patch-2

Added Jade Angular Snippets
Add `OPTIONS_HADDOCK` snippet
use m as prefix and fix conflicts with other snippets
Merge pull request #325 from jdnavarro/master

Add `OPTIONS_HADDOCK` snippet
Merge pull request #320 from wongyouth/add_rails_methods

Add rails callback methods
Allow java else/elif to be expanded mid line.