[WIP] Add the capability to remove a given project and all related frames

[jnsebgosselin]

Fixes #192

• [x] Add a method to Watson class to delete project by name
• [ ] Add the functionality to the CLI
• [ ] Add tests
• [ ] Update documentation

[k4nar]

Thanks for the PR!

As it's a dangerous operation, I think we should ask the user for confirmation. Here is a pattern for doing that with Click: http://click.pocoo.org/5/options/#yes-parameters

Ideally, we should also tell the user how many frames this will delete.

[jnsebgosselin]

@k4nar for the pointer.

I agree. I'll do that when I implement this feature in the CLI.