Update providers for 1.6. Consolidate providers/APIs onto one page.

For https://github.com/jclouds/jclouds.github.com/issues/96

Compute providers/APIs taken from https://github.com/jclouds/jclouds/blob/master/allcompute/pom.xml

Blobstore providers/APIs taken from https://github.com/jclouds/jclouds/blob/master/allblobstore/pom.xml