Make Document non-final
Make Document non-final

https://forums.couchbase.com/t/feature-request-why-is-document-a-final-class/2548/1

mariosotil/couchbase-lite-java-core,mariosotil/couchbase-lite-java-core,couchbase/couchbase-lite-java-core,Spotme/couchbase-lite-java-core,gotmyjobs/couchbase-lite-java-core,4u7/couchbase-lite-java-core,netsense-sas/couchbase-lite-java-core,mariosotil/couchbase-lite-java-core