removed redundant comment

The @name already documents what class this is.
proofread
proofread
proofread, added English translation
proofread

* removed unnecessary documentation that was repeated
* added English translation
added English translation
added English translation
proofread
Merge pull request #281 from tygerpatch/master

Various fixes for the English API documentation.
Timeline#exec and cue should return `this`.
Merge pull request #293 from authorNari/patch-1

Timeline#exec and cue should return `this`.
remove BOM
Merge branch 'master' into develop