Rename project from `action.js` to `action`.
Update readme.
Merge pull request #14 from zpbx/dev

Rename project from `action.js` to `action`.
Update README.md
Tiny optimization.
Add return value for `.trigger()` API.
Tiny optimization.
Merge pull request #15 from zpbx/dev

Add return value for `.trigger()` API.
Add source files of documentation, resolve #13.
Merge pull request #16 from zpbx/dev

Add source files of documentation, resolve #13.