Reviewers: shindig-dev, Description: Overhauled the implementation of Data Pipelining in Templates. <os:ViewerRequest>, <os:OwnerRequest>, <os:PeopleRequest> (@userId and @groupId only for now) and <os:DataRequest> (@href and @format=json|text only for now). Supports automatic dependency detection and chaining
TODOs: * support all proposed tags, attributes * remove dependency on templates * move into own feature, or core. * add more Unit tests Please review this at http://codereview.appspot.com/10041 Affected files: features/opensocial-templates features/opensocial-templates/base.js features/opensocial-templates/compiler.js features/opensocial-templates/container.js features/opensocial-templates/data.js features/opensocial-templates/data_test.js features/opensocial-templates/ost_test.html features/opensocial-templates/template_test.js java/server/src/test/resources/endtoend/opensocial-templates/data_test.js
