Modified type_accessor to not call normalize. Also adjusted Unit test cases accordingly
Added new accessors for various Hypervisors in Builder and also added Unit Test cases
Modified CDImage to yield to a block during construction and modified unit test cases accordingly
1) Added a new class called AutoZone to get automatic timezone information from various web services.
2) AutoZone uses multiple web services to get the data instead of just one.
3) Modified TimeZone and Mirrors classes to use AutoZone.