Merge test projects

The functional-test-1-5 and functional-test-1-5-tests are merged into
one functional-test project. This is now possible since the m2e-android
plugin supports tests within the same project.

The project now uses the fest-android dependency since it provides
matchers for Android classes. Also it uses fest-assert-core instead of
fest-assert, so it does not references non-Android classes like
java.awt.image.BufferedImage.