Rbx builds require sudo.
Inherit key coercions.
Refactor property definitions and initializations
Merge pull request #258 from Erol/refactor-property-definitions

Refactor property definitions
Fix handling of default proc values in Mash
Merge pull request #259 from Erol/fix-default-array-values

Fix handling of default proc values in Mash
Public utility methods for stringify/symbolize keys