Replaced typedef enum with typedef NS_ENUM for stronger typedefs.
Added +setDefaultViewController: method as an alternative to subclassing TSMessage. Also made TSMessage use defaultViewController whenever no viewController was specified.
Minor hotfix.
Fixed using the wrong font weight when no specific font was set using the config file
Merge pull request #50 from adlai-holler/ns-enum

Use NS_ENUM rather than enum
Merge branch 'setdefaultvc' of github.com:adlai-holler/TSMessages into adlai-holler-setdefaultvc
Updated documentation
Updated pragma marks