the target directory shouldn't be in source control
plugin zips shouldn't be in source control
plugin.xml shouldn't be in source control
deleted unused files
You have to use Grails 2.0+ to release plugins, although you can target earlier versions
don't put jar files in the lib dir, add dependencies in BuildConfig.groovy. Also added a dependency for the quartz and release plugins
Probably no need to support 1.3.x
cleanup
added new required properties
added .gitignore