JCLOUDS-870: Adds the missing projects to the default project list
JCLOUDS-861 & JCLOUDS-911: Improved the way image OSFamily is parsed and
configured the default username for each image type.
* Documented why we implicitly lookup project name using project id; corrected README, pom, ApiMetadata and added tests.
* Introduced jclouds.google-compute-engine.project-name property used to adjust the project commands affect.
* Flattened quasi-generated pagination classes into package-private members of their callers.
* Removed invalid fallbacks for lists. List responses are empty; they don't return 4xx!
* Adjusted test configuration to allow bearer token properly.