add support to SnipMate.vim's option "g:snippets_dir"
Merge pull request #72 from rykka/patch-1

Add support to SnipMate.vim's option "g:snippets_dir"
- Added .gitignore file.
- Fixed snippet like multi snippet behavior.
- Improved quick match behavior.
- Improved multi snippet description.
- Don't split when execute :NeoComplCacheEditRuntimeSnippets and :NeoComplCacheEditSnippets commands.
- Improved quick match behavior.
- Fixed asyn caching error.
- Re-Fixed asyn caching error.
- Fixed asyn caching error.
- Added neocomplcache#sources#filename_complete#get_complete_words().
- Fixed filename_complete.
- Fixed filename_complete problem.
- Improved get glob files.
- Fixed filename_complete.
- Fixed error.
- Improved features dictionary.
- Genetate relative path in include_complete.
- Merged.