Improvements to Informix support - better support Informix datatypes and changelog generation.
Merge branch 'master' of https://github.com/ms-novatti/liquibase into ms-novatti-master

Conflicts:
	liquibase-core/src/main/java/liquibase/snapshot/jvm/IndexSnapshotGenerator.java
Merge branch 'ms-novatti-master'
Merge remote-tracking branch 'origin/master'