fix #1192 apidocs for Data.common (ac.data and ac.pageData)
correct copy/pasted comment... s/data/pageData/
update mojit-proxy and model-vanilla apidocs

- get/set @method for data/pageData
- change type from Object to Model.Vanilla so class docs
  are linked
- update todo comments so we don't forget to update docs
  after yui/yui3#323 lands
Merge pull request #1201 from isao/apidocs

fix #1192 apidocs for Data.common (ac.data and ac.pageData)