Update datamanger to latest models
Remove setting vertical from mainToCompose segue
Update initial data to match new model
Merge branch 'feature/datamanager'

Conflicts:
	Greatist Message Publisher/Greatist Message Publisher/GRTComposePostViewController.m
	Greatist Message Publisher/Greatist Message Publisher/GRTPostTableViewCell.h
	Greatist Message Publisher/Greatist Message Publisher/Model/GRTDataStore.m