First pass at Backbone models/collections

This will need to be updated as more entities are added in the coming weeks.

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2197 f69abe3c-2ee2-4550-9a6d-17bd458115be
Remove debugging code

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2198 f69abe3c-2ee2-4550-9a6d-17bd458115be
Actually parse timestamps into Date objects

Adds an additional check to make sure we can actually attempt this too, since
Date doesn't like NaN very much.

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2199 f69abe3c-2ee2-4550-9a6d-17bd458115be
Remove GMT dates from parsing

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2200 f69abe3c-2ee2-4550-9a6d-17bd458115be
Operate on a copy of the Post's attributes

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2201 f69abe3c-2ee2-4550-9a6d-17bd458115be
Parse the author properties into an Author object

See #270

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2202 f69abe3c-2ee2-4550-9a6d-17bd458115be