Update content-type to application/json to fix encoding issue.
Set uncompilable reminder to set Buddy keys in sample apps.
Update .gitignore to not commit Podfile.lock files for sample apps.
Fix createUser crashers by using proper serializer when creating a user.
Only serialize *up to* base classes, and not NSObject properties.
Remove unnecessary callback method declarations in the header for RegisterViewController.
Merge hotfixes for 2.0.2