using scala 2.10.2
refactored event dao implementations under impl subpackage,

created single 'Finder' trait under grid.event.dao to communicate/aid in creating different instances
Finder renamed to just FindDao
sveAndForget added
event group added
 event gropus most tests passing
event group find tests
event group find tests
db fixes for when all db tests are run in a suite
event logging actor