update badges, docs, quick start

Merge pull request collerek#93 from collerek/enums

Enums

Merge pull request collerek#92 from collerek/cascades

Cascades

Merge pull request collerek#87 from collerek/forwardref

Processing of Forwardrefs

Merge pull request collerek#82 from collerek/inheritance_1

Introduce inheritance

Merge pull request collerek#76 from collerek/issue_73

connect db, bump ver, update releases

change issue in docs

fix negative offset in tests

fix tests

fix connecting