FB 5143. was blowing up with a NPE when trying to get disk size on
listProducts. Relates to FB 5133 as well.
Conflicts:
	src/main/java/org/dasein/cloud/google/compute/server/ServerSupport.java
Merge pull request #152 from unwin/develop

FB 5143. was blowing up with a NPE when trying to get disk size on