Update to newest sql-query

Fix SQLite index name collisions.

Closes dresende#499

Fix hasMany.getAccessor().count()

Add tests for sqlite Dialect.clear. Closes dresende#497

v2.1.9: (dresende#456, dresende#375, dresende#273, dresende#495)

Update changelog

Add explicit integer type

Add ChainFind.omit

Fix duplicate key indices - dresende#484

Add date to changelog