upgrade to grails 2.1.0
Added ignoredColumns property
Fix for GPDATABASEMIGRATION-120

fix for http://jira.grails.org/browse/GPDATABASEMIGRATION-120
Also added additional debug logging
minor internal changes
Merge remote-tracking branch 'ph4t/master'

Conflicts:
	.classpath
	.gitignore
	DatabaseMigrationGrailsPlugin.groovy
	application.properties
dropped support for 1.3.x
cleanup from PR merge
GPDATABASEMIGRATION-122 log errors to stdout