Provide means of testing supported services

[oubiwann]

Testing of services will necessarily be manual in nature due to the fact that not every service provides a public sandbox for testing authentication and the additional complexity of using something like Selenium to test the results.

Tasks:

• Create a config.ini file for all supported services - Create a config.ini file for all supported services #69
• Add envini library as a dep - Add envini library as a dep #70
• Define manual steps for testing services and document them - Define and document the manual steps needed for testing services #71
• Explicitly state which services are regularly tested (and thus supported) - Explicitly state which services are regularly tested #72
• Provide information to developers/contributors who want to see services added - Provide information to developers/contributors who want to see services added #73

Part of release #64