First version of a new concurrency option to limit concurrency. Not yet supported if --hits is applied
Add tests for new concurrency option, implement concurrency limitation on hits based run
Fix timeout
make flake happy
Move url resolving to *before* the request has been prepared.

This resolves issue #193, allowing cookies being matched against the correct (resolved) domain and correctly sent back to the server.
Merge pull request #194 from mjpieters/master

Move url resolving to *before* the request has been prepared.
Don't try to import the test module until we've installed the deps.
Merge pull request #196 from mozilla-services/rfk/dont-import-until-deps-installed

Don't try to import the test module until we've installed the deps.
Merge branch 'feature/limit-concurrency'

* feature/limit-concurrency:
  make flake happy
  Fix timeout
  Add tests for new concurrency option, implement concurrency limitation on hits based run
  First version of a new concurrency option to limit concurrency. Not yet supported if --hits is applied