Hanami contributors

All mjbellantoni commits

Tests the private API Repository.execute.model
Make Respository.execute private (issue #190.)model
Fixes bug #113 where Params are incorrectly converted to hashes.controller
Responds to code review feedback.controller
Removes empty else block.controller
Fixes formatting.controller
Adds the 'Validatable' module.controller
Defers call to symbolize!controller
Adds param whitelisting to Lotus::Action::Params.controller
Adds the ability to specify a class which defines the params.controller
Adds convenience method for creating anonymous classes.controller