create lair helpers table
add helper_checkin model, tests
enforce helpers to be active
enforce routes receive json format
add hook to convert boolean parameters for all routes
add ParamsHelpers module, coerce_boolean_strings method
use ParamsHelper to preprocess boolean params
stubs for lair/helperscontroller
implement lair/helperscontroller::index
add test for inactive flags
Merge pull request #13 from cs198/lair-helpers-index

Lair helpers index
Merge pull request #12 from cs198/controller-refinements

Controller refinements
Merge pull request #11 from cs198/helpers-model

Helpers model