GCE back in alignment with core.
created partially implemented code to create image from disk once API
catches up...
FB 5652 getVLANVisibleScope returns VisibleScope.ACCOUNT_GLOBAL instead
of null.
FB 5652 - more visible scope changes
Whoops!
Merge pull request #215 from unwin/develop-ROGER-RDS-TEST

GCE back in alignment with core.
* repaired cache collision with sql and compute
* moved cache constructors to class constructor
* modified listProducts to cope with options being null (NPE)
forgot to add this file to commit.
Merge branch 'develop' of git@github.com:greese/dasein-cloud-google.git
into develop-ROGER-RDS-TEST

Conflicts:
	src/main/java/org/dasein/cloud/google/Google.java
new line
Merge pull request #217 from unwin/develop-ROGER-RDS-TEST

fixes for NPE and cache conflict