Create Test Cases and run Code Coverages

[lewismorgan]

In order to help with bugs and to help with designing and implementing a proper API for linking other websites with HarvesterDroid, create test cases and run code coverages for the entire application. Goal is for API (non-interfaces) and all non-UI code (ex: Providers, Factories) to have test coverage for all public facing methods.

• Use Spek as testing framework
• Add test cases for classes with logic
• Add code coverage through Gradle