Add Android alert generation to Happathon Engine

[a-laughlin]

The happathon engine is a standalone black-box form and alert generator that will eventually be ported to other platforms so that other apps can include it to trigger actions in their own app based on well-being states. This issue only addresses the alert generator.

For specs, check out the scenarios in the specs doc

The engine should be encapsulated in its own directory ([here](Directory at:
https://github.com/IDCubed/oms-happathon/tree/master/src/common/happathon-engine)).

Related to:
#22