Allow user to specify authorization scopes when creating token
Add unit tests for default scopes parameters and add to travis build
Refactor Token command to use subparsers

Separate list, get, set & create subcommands of `scc token`
Add http link in description of scc token create subcommand
Add --no-set optional argument to create a token but not set it
Fix TestToken unit tests
Add choices parameters for scope creation with corresponding unit tests
Use classical form of assertRaises()
Merge pull request #70 from sbesson/token_scope

Token scope