Clean up of POM structure

- Remove project pom, this introduces the possibility of dependencies in labs that do not exist in jclouds itself, complicating the process of bringing over new modules
- Ensure simple parentage of poms, this should resolve issues people are having with relative paths of the parent pom.  For this project, it simply isn't necessary.  I didn't have to build jclouds 1.7.0-SNAPSHOT in this case.
- Ensure all poms parent through the toplevel pom instead of parenting directly to jclouds.