add ping test with a param
[testing] add api version in ping path
add versioning stuff in api core
add first modules structure and ping module
suppress annoying rspec warnings and modularize ping logic
[testing] add protected ping test
add user factory
add token module in api
add protected ping route
refactor auth logic into local helper
refactor auth logic into global helper (API root)
add params validation both token and ping endpoints
add optional params both token and ping endpoints