* Add tests for login view
* Fix OAuth auto login redirect loop
login_error cookie is only set when the OAuth login fails
for some reason. Therefore, the login view should return
immediately if a login_error cookie exists before trying
to login the user using OAuth again.
* Fix test
Use 'index-template' instead of 'index' for testing
* Add some comments
This changes forks the mysql part of the Macaron session middleware.
In the forked mysql file:
- takes in a config setting for SetConnMaxLifetime (this solves wait_timeout
problem if it is set to a shorter interval than wait_timeout)
- removes the panic when an error is returned in the Exist function.
- retries the exist query once
- retries the GC query once
