clean up Podfile
Modify delegate interface for LFSPostViewController
Add delete content functionality

Note: this breaks direct call compatibility with RC1 of v0.2.

Also make “postMessage” method more generic, supporting not only likes/unlikes,
but also deletes, bozo and other moderator-level functions.

Add a test to verify that delete action returns HTTP 200 and a JSON
object that has the same content id as the one being deleted.
rename user -> userToken whenever appropriate
Support deletion of author content

This fixes a mistake in enum strings made in the previous few commits.
Further changes supporting deletion of content

In LFSWriteClient check that critical parameters are not nil.

In LFSCollectionViewController (sample app project), support editing only if user token is set.