Adding web mock and vcd to dev dependencies-list
Using VCR to fake out Stormpath API

- create_test_user renamed to obtain_test_user, which will attempt to load a user if credentials supplied for creation cause an error to be raised (because of duplication). This is to handle the scenario in which a prior test run failed before cleanup occurred (which would prevent future runs from succeeding).

- each test now destroys its setup data in an after block

- a before(:each) block now reloads the Stormpath::Rails::Client class definition. The class itself is stateful, and we want to make sure each test is atomic.
Ignoring VCR cassettes via gitignore
Merge branch 'chores/use_vcr_stub_server_api-20' into development