add java-core submodule
add gradle wrapper
ignore .gradle file
add settings.gradle
add more things to .gitignore
remove dependency on couchbase-lite-android
add submodule for couchbase-lite-android
change artifact version to use hardcoded version rather than UPLOAD_VERSION_CBLITE (needs to be fixed, or at least re-named)
re-add dependency on ':libraries:couchbase-lite-android' submodule
add example local.properties file