Various (#38)

* Add create_indexes_for_multiple_databases
* Add drop_indexes_for_multiple_databases
* Release 0.9.0

Fix publish script

Release 0.7.0

Release 0.6.0

Release 0.5.1

Release 0.5.0

Release 0.4.1

Release 0.4.0

Fix codecs

Release 0.3.2