Fixed #430
Fixed #708
Fixed #469
Fixed #626
Merged upstream changes
Moved callbacks attribute from a List to a primitive array
Added callbacks property to ant builds and added ant tests for it.  Also fixed flyway-core tests to be compatible with the callbacks array
Added a default FlywayCallback impl for testing and as a base class adapter for clients not wanting to implement all interface methods.  Also added command line callback usage and parameter tests.
callbacks Maven property and tests