Added Actions API client: ServiceCharmActions
Added Actions API client: ServiceCharmActions

Updated tests and return type for api/actions ServiceCharmActions.
Added Actions API client: ServiceCharmActions

Updated error catching for ServiceCharmActions and added test
Use new names.ServiceTag over the wire
No longer export client API ServicesCharmActions
Merge pull request #917 from binary132/api-servicecharmactions

Added Actions API client: ServiceCharmActions