Add little travis-ci build status icon to README
Bugfix for newbytes.split() and .rsplit()
Fix bug and add test case for bytes(bytes(b'ABC'))
Document some more limitations
Upgrade http.client: now it is backported from Py3.3, not from Py2.7
Add http.server (backported from Py3.3) and tests

Some tests are still failing: marked expectedFailure or skip
Remove broken threading support from test.support
Bump version to 0.5.1-pre