Drop dev-requirements.txt

This is no longer required for tests to pass.
Also geocoding which is not a dependency is not required for tests.

dev-requirements.txt

-https://hg.logilab.org/master/cubes/geocoding/archive/default.tar.bz2
-https://hg.logilab.org/master/cubes/addressbook/archive/default.tar.bz2

tox.ini

@@ -4,7 +4,6 @@ envlist = py27, py3, flake8, check-manifest
 [testenv]
 deps =
   pytest
-  -rdev-requirements.txt
 commands =
   {envpython} -m pytest {posargs}