WINDUP-167 (Test-Ignored): Check for duplicate @TypeValues
WINDUP-159: Added GraphService tests
WINDUP-194: Add remove method to Service to remove a vertex.
Merge pull request #163 from mbriskar/WINDUP-159

WINDUP-159: Added GraphService tests
Merge pull request #176 from mbriskar/WINDUP-194

WINDUP-194: Add remove method to Service to remove a vertex.
Merge pull request #167 from mbriskar/WINDUP-167

@Ignore'd test for future impl of WINDUP-167.
WINDUP-167: Check for duplicate @TypeValues