Remove downloadcache tox config value.

The `downloadcache` config value is deprecated by tox and the related `--download-cache` flag is removed on pip version 8.0 (deprecated in 6.0). With this change tests should run with the lasted versions of all tools (they do not without it).

Author: waylan

tox.ini

@@ -2,7 +2,6 @@
 envlist = py27, py32, py33, py34, pypy, flake8, checkspelling
 
 [testenv]
-downloadcache = {toxworkdir}/cache
 deps = -rtest-requirements.txt
 commands = coverage run --source=markdown {toxinidir}/run-tests.py {posargs}
            coverage report --show-missing
@@ -16,4 +15,4 @@ deps =
 commands = {toxinidir}/checkspelling.sh
 
 [flake8]
-max-line-length = 119
+max-line-length = 119