Fix for Issue 14

https://github.com/couchbase/couchbase-lite-java/issues/14
build.gradle - Attaches tasks to test that will copy all the tests from
android to Java, delete tests that are known not to work and copy all
the assets. Note that these are now 'attached' to test so anytime test
is called these tasks will automatically be called first.
   Note that we assume that the android project is in a parallel directory
to the Java project. If that isn't a safe assumption then we can always
just move the location into a property.

LiteTestCaseBase/LiteTestContextBase - Pretty self explanatory.