Fixes and updates for media uploads in the new editor

This PR fixes https://github.com/wordpress-mobile/WordPress-iOS-Editor/issues/344 and contains an updated editor pod which fixes an issue with remote URLs on images not being updated.

/cc @diegoreymendez 
Split these guys into 1 line per parameter if possible... also minor but helps with readability imho.  This is also mentioned in our [style guide](https://github.com/wordpress-mobile/WordPress-iOS/wiki/WordPress-for-iOS-Objective-C-Style-Guide).