tox: No longer needs to install requirements/dev.txt

tox.ini

@@ -13,7 +13,6 @@ deps = -r{toxinidir}/requirements/default.txt
        -r{toxinidir}/requirements/test3.txt
        -r{toxinidir}/requirements/test-ci.txt
 commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
-           pip install -r{toxinidir}/requirements/dev.txt
            pip install anyjson
            nosetests -vd celery.tests                          \
                --with-xunit                                    \
@@ -26,7 +25,6 @@ deps = -r{toxinidir}/requirements/default.txt
        -r{toxinidir}/requirements/test3.txt
        -r{toxinidir}/requirements/test-ci.txt
 commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
-           pip install -r{toxinidir}/requirements/dev.txt
            pip install anyjson
            nosetests -vd celery.tests                          \
                --with-xunit                                    \
@@ -38,7 +36,6 @@ 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 -r{toxinidir}/requirements/dev.txt
            pip install anyjson
            nosetests --with-xunit                               \
                      --xunit-file={toxinidir}/nosetests.xml     \
@@ -52,7 +49,6 @@ 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 -r{toxinidir}/requirements/dev.txt
            pip install anyjson
            nosetests --with-xunit                               \
                      --xunit-file={toxinidir}/nosetests.xml     \
@@ -66,7 +62,6 @@ 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 -r{toxinidir}/requirements/dev.txt
            pip install anyjson
            nosetests --with-xunit                               \
                      --xunit-file={toxinidir}/nosetests.xml     \