api_methods: JSON parsing should be done with the quirks_mode option set to true

Otherwise response like: "true" will raise an exception
see: https://github.com/flori/json/issues/16
Implement oauth2 support
Implement refresh_access_token
Update discussions api methods list

add get_list
Add a new example: operations
Use indentation of two spaces where four spaces used
Merge pull request #1 from theosp/add_oauth2_support

Add oauth2 support, update api methods, improve README, JSON related bugfix