added Robolectric 2.3 for tests
* added com.github.kevinsawicki:http-request:5.6 to allow bootstrap tests to compile
* exclusions in build.gradle for Robolectric
* update support-v4 and support-v7 libraries to v20.0.0
* project.properties with reference to appcompat-v7 library
* TestBootstrapApplication and TestModule for facilitating injection and injection of Mockito mockups