Merge pull request #2 from crazymaster/master

Updated README.
- Deleted clear result in complete_check().
- Improved for frequencies.
- Deleted context_filetype#set().
- Optimized by if_lua.
- Renamed source names.
- Renamed sources.
- Deleted :Neco.
- Fixed converter_remove_next_keyword.
- Improved for complete select.
- Improved clear result timing.
- Added case converter.
- Improved mappings.
- Improved detect completefunc behavior.
- Improved lock behavior.
- Fixed feedkeys().
- Improved documentation.
- Improved examples.
- Fixed syntax source.
- Refactorred variable names.