Issue #211 - Use services instead of META-INF/services for sqlitestorageengine.

https://github.com/couchbase/couchbase-lite-android/issues/211
Merge branch 'refs/heads/issue_211'
Issue #211 - Use services instead of META-INF/services for logger.

https://github.com/couchbase/couchbase-lite-android/issues/211