Issue #44 - Switch to HttpURLConnection

* ...which allow us to perform invalid URI connections
* The hash 'h' param will not be URLEncoded, containing the '='
character at the end
Issue #44 - Add License
Issue #32 - Move parser package inside the api one
Issue #32 - Remove unnecessary abstraction

* No need to optimize this yet with abstractions
Issue #44 - Provide timestamp in each sync request

* Create sync_time table in the DB
* Save/Retrieve sync times, per SurveyGroup
* Add SurveyedLocalesResponse, as a wrapper for API response
* Request and parse this wrapper, getting a modeled response from the
FlowApi helper