Merge pull request #90 from zhaocai/master

Add silent to doautocmd, quite autoload
- Added documentation.
- Improved redraw_echo().
- Fixed resource leak.
- Fixed neobundle#source().
- Fixed :NeoBundleClean behavior.
- Fixed neobundle#source() behavior.
- Fixed call on_source hook.
- Improved reinstall behavior.
- Fixed neobundle#util#redraw_echo().
- Fixed parse error.
- Changed on_source timing.
- Improved documentation.
- Fixed typo.
- Added FAQ section.
- Improved FAQ.
- Improved neobundle#installer#get_reinstall_bundles().
- Implemented auto detection in neobundle#local().
- Changed install information(incompatible with old information).
- Fixed for local bundles.
- Added on_post_source hook.