Add inline if snippet to c.
Merge pull request #239 from kenshin54/master

Add inline if snippet to c
replace Filename by vim_snippets#Filename and document it

It doesn't make sense that all snippet engines have to
keep this function somewhere
ruby snippets:

use do dov for both engines
drop #TODO comments

changing defaults is bad, but I expect ruby folks to expect do to type
do ..

doo has the advantage to get a completion popup .. but its too long to
type

The UtiSnips do snippet didn't make sense: the nested placeholder still
didn't remove the space after the "do" when deleting it - so it was
written badly. Could be fixed, by why bother?

Thus learn do and dov and be happy forever. Would Do be a better choice
(upper case chars?) Don't know. This was used by UltiSnips.

Comment on this commit if you don't like this choice.
Small tweaks to javascript.snippets
Adds if and elseif snippets to lua.snippets
Merge branch 'master' of github.com:honza/vim-snippets