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
Be sure we don't print more chars than the tty size.
get rid of the klass variable
Make sure everything ran okay
make the terminal-size output only if sys.platform != 'win32'
split db-related things in loads.db
use real data in the db test
Isolate the relative percentage computation

And add a test for it.
Merge pull request #23 from mozilla-services/concurrent-sessions

Create a testclass for each greenlet.
Simplify the code + testing
Catch the exceptions before it's too late.
Make the test_result object return consistent values