added validation that name must be present
wrote test for name presence validation
added validation to require presence of description
added description to let block
wrote test to require presence of description
tests for the service name to be unique
wrote validation to require the presence of an organization
added organization id to let block
refactored existing tests
added test to require presence of organization
fixed user_spec test that was broken as result of validation
Merge pull request #24 from copperheads-2014/services-model-tests-rebased

Services model tests rebased