oauth support

[12cowdog72]

Hello friends, please include an oauth. I have attached a library that may be of help:

https://github.com/doorkeeper-gem/doorkeeper

This can be of use for applications like the tagger instead of provide password.

[nonamethanks]

You don't need to provide a password, you can just use an API key with specific permissions.

[12cowdog72]

Ask for API key looks suspicious to user, and you have to worry if user give right permissions and not extra etc. oauth token like API keys, but easier for user. @bipface I like to know why you disagree.

[ErikHumphrey]

Multiple API keys with different permission scopes are possible too, like ArenaNet does. It doesn't have to be OAuth tokens.