This commits replaces the stream frame queue with a framer which
requests data from the streams just when a frame is needed by the
packet packer. This simplifies a lot of things and allows some other
refactorings, see issue #83.
There are a few pending tests which will be fixed soon.
this commit also moves the {Before,After}Suite functions from the
integration_test.go file into the integrationtests_suite_test.go file,
and adds the docker-specific hooks.
ref #162
