Tox must now install kombu master

tox.ini

@@ -42,6 +42,7 @@ deps = -r{toxinidir}/requirements/default.txt
        -r{toxinidir}/requirements/test.txt
        -r{toxinidir}/requirements/test-ci.txt
 commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
+           pip install http://github.com/celery/kombu/zipball/master
            nosetests --with-xunit                               \
                      --xunit-file={toxinidir}/nosetests.xml     \
                      --with-coverage3 --cover3-xml              \
@@ -54,6 +55,7 @@ deps = -r{toxinidir}/requirements/default.txt
        -r{toxinidir}/requirements/test.txt
        -r{toxinidir}/requirements/test-ci.txt
 commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
+           pip install http://github.com/celery/kombu/zipball/master
            nosetests --with-xunit                               \
                      --xunit-file={toxinidir}/nosetests.xml     \
                      --with-coverage3 --cover3-xml              \