Expose self.args as self.config to the TestCase classes
Create a testclass for each greenlet.

This allows to have concurrent sessions at the same time.
Pass the config to the testcase.
work in progress
Test that session objects don't mangle each others states.
we need to do multiple requests to have the state mangled
Move the creation of the test class in the greenlet
Test that we pass the configuration

And that we overwrite the server_url argument.
merge with master
get rid of the klass variable
Make sure everything ran okay
Merge pull request #23 from mozilla-services/concurrent-sessions

Create a testclass for each greenlet.