Up to GAE SDK version 1.8.6, and changing group IDs after the move to ASF

Also replacing BlobMap for gae-guice, which will be removed for jclouds 1.7.0
Fixing gae-spring for jclouds 1.7.0-SNAPSHOT (see c944b83b)
Trying to display the jclouds version on the home and Tweet listing pages