add Grails 2.2, based on Grails 2.1
add Grails 2.2, based on Grails 2.1

Currently at 2.2.5, the most recent of the 2.2 series.

Closes #385.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

jimhe/homebrew-versions,UniqMartin/homebrew-versions,DomT4/homebrew-versions,heuermh/homebrew-versions,coeligena/homebrew-verscustomized,Ashton-W/homebrew-versions