update to prev bugfix.
small change.
challenges/vouchers archive setup.
Merge branch 'develop' into feature/rewards_updates
archiving + small changes.
Merge branch 'develop' into feature/rewards_updates
fix for stupid project corruption issues.
persisting/network challenges stuff.
Added equality methods to some API classes (for dynamic updates).
Challenges modal presentation stuff. Nearly working.
Merge branch 'develop' into feature/rewards_updates
Merge branch 'develop' into feature/rewards_updates

Conflicts:
	gbk/GBK.xcodeproj/project.pbxproj
	gbk/gbk/Source/GBKHomeViewController.m
Notifications for challenge updates.
mem management bugfix.
parsing bugfix.
challenges = improved dynamic updates.
modal display bugfix.
Merge branch 'feature/rewards_updates' into develop