Create a Gender enum
Create an ActivityType enum

I'm not crazy about deriving Read, but it seemed better than pattern
matching against tons of stuff.
Create an AgeGroup enum
Create a WeightClass enum
Create a SegmentActivityType enum
Create a Resolution enum
Create a SeriesType enum
Create a ResourceState enum
Create a MeasurementPreference enum
Create an ActivityZoneType enum
Create a PhotoType enum
Create a ClubType enum
Create a SportType enum
Create a FrameType enum
Clean up enums
Fix field names
Merge branch 'enums'

Conflicts:
	library/Strive/Options.hs
Fix #61; use real lenses