tox: remove 'meta', do pyflakes/smoketest in each build

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27,py33,py34,py35,meta
+envlist = py27,py33,py34,py35
 skip_missing_interpreters = True
 
 # There's a race-condition bug in Twisted-15.5.0 (#8014, fixed in trunk) that
@@ -26,9 +26,11 @@ skip_missing_interpreters = True
 deps =
     git+https://github.com/twisted/twisted#egg=twisted
     #twisted
+    pyflakes
     {env:EXTRA_DEPENDENCY:}
-    coverage
 commands =
+    pyflakes setup.py src
+    wormhole --version
     trial {posargs:wormhole}
 
 # on windows, trial is installed as venv/bin/trial.py, not .exe, but (at
@@ -37,10 +39,3 @@ commands =
 # a script name (since "python -m twisted.scripts.trial" doesn't have a 'if
 # __name__ == "__main__": run()' -style clause). The script name will vary on
 # the platform.
-
-[testenv:meta]
-deps =
-    pyflakes
-commands =
-    pyflakes setup.py src
-    wormhole --version