Upgrade to Grails 2.2.1

I upgrade to Grails 2.2.1 and Groovy 2.1.  This includes updates for all
core plugins such as tomcat and hibernate.  I also fix a problem in
DataSource.groovy that the dbunit plugin supposes JNDI data sources.  I
deactivate it by explicitely setting jndiName to null.
Remove fixtures after running tests

I add functions to delete the fixtures such as phone calls,
organizations, and persons after running the test cases.  This is
necessary because the DbUnit clean up throws integrity errors when
deleting objects referencing other ones by foreign key.