Dailymotion

- Add installation from "pip" in the README.md
- Add coveralls.io & Travis badges in the README.md
- Replace **nose** by **pytest**
- Delegate to API the grant_type management

- Removed pycurl and shelve modules
- Use requests_toolbelt for video upload
- Simplified the access token storage, They are now stored in memory by default.
But we recommand to store theme in a protected OS directory.
- Explained in the Readme how authentification work in the SDK, and how access tokens are stored.