Updating gitignore.
Stubs out Reader ViewControllers and a new datamodel version.
Adds reader API calls to the WordPressComApi.
Adds basic unit tests for the api -- only testing the presence of the end points at this time but something to build on.
Committing progress on data model changes.
Removes the 3.6 model version. Replaces it with version 11.
Adds classes for the reader post and comment models.
Abstracts the abstractpost and comment models so the different post and comment models share inheritance.

Migration is up next.
This is a work in progress, do not build from this commit.
Removing obsolete model version reference.
Updates to Native Reader data models and API calls.
Improvements to unit tests.
Probably close to where we'll end up with the data model.  Might drop the ReaderContext and Reader configuration since they seem superfulous at this point.