Move JavaContext from couchbase-lite-java-core

* Move JavaContext from couchbase-lite-java-core

* Created JavaSQLiteStorageEngineFactory that will return JavaSQLiteStorageEngine natively without going thru the reflection

* Add getSQliteStorageEngineFactory() method to LiteTestContextBase class that will return a JavaAQliteStorageEngineFactory object.

* Delete src/main/resources/services/com.couchbase.lite.storage.SQLiteStorageEngine file as we do not need that any more
Merge pull request #41 from couchbase/feature/issue_431_storage_engine

Move JavaContext from couchbase-lite-java-core