Use actual value for SINGLE_QUOTES/DOUBLE_QUOTES
Add snippets `'`, `"` and `doc`

`'` and `"` use a new function `triple_quotes_handle_trailing` which
handles trailing/existing quotes.

This handles expansion of`"|"`, where the second quote gets automatically
inserted by e.g. delimitMate.
Merge pull request #470 from blueyed/python-doc-quotes

Python: add triple doc quotes and handle expansion of `"|"`
Ultisnips CSS colour spacing
ol. and ol# are missing a double quote

ol. and ol# snippets are missing a double quote.
Merge pull request #472 from yerv000/patch-1

ol. and ol# are missing a double quote
Merge branch 'master' of https://github.com/honza/vim-snippets