Switch all random Ion network calls to OkHttp

[TristanWiley]

Right now we're doing authenticated calls with OkHttp and Ion for random stuff (mainly because I was writing quick code and Ion is nice).

We need to switch Ion network calls to OkHttp and we can get rid of the Ion library completely.

No hate koush <3

#41 removed Ion for image loading, this is just killing it the rest of the way.

[TristanWiley]

Almost done, just waiting on #46