Fix sample data for flavors.

This should resolve issue #28.  Flavors are now strictly a sub-resource of
resource_classes, so change this to add them to our sample resource class.
Adds POST /api/resource_classes/flavors and PUT /api/resource_classes/flavors/1

on request from UI (@jprovazn) and tuskar_client (@jistr)
Merge pull request #32 from marios/update_flavors

Adds POST /api/resource_classes/flavors and PUT /api/resource_classes/fl...
Merge pull request #28 from jguiditta/fix_sample_data

Invalid sample data