EventBrite Auth Provider Pull request

Please check the code and merge.

Cheers.
This one provokes:

```
com.typesafe.config.ConfigException$Parse: conf/play-authenticate/mine.conf: 290: Expecting close brace } or a comma, got '=' (if you intended '=' to be part of the value for 'clientId', try enclosing the value in double quotes, or you may be able to rename the file .properties rather than .conf)
	at com.typesafe.config.impl.Parser$ParseContext.parseError(Parser.java:435)
	at com.typesafe.config.impl.Parser$ParseContext.parseError(Parser.java:431)
	at com.typesafe.config.impl.Parser$ParseContext.parseObject(Parser.java:880)
	at com.typesafe.config.impl.Parser$ParseContext.parseValue(Parser.java:520)
	at com.typesafe.config.impl.Parser$ParseContext.parseObject(Parser.java:803)
```