updating tox and travis configs

.travis.yml

@@ -1,9 +1,8 @@
 language: python
 install:
   - "pip install ."
-  - "pip install -r requirements-tests.txt"
+  - "pip install tox"
 script:
   - tox
-  - coveralls
 env:
   - TOXENV=py27

tox.ini

@@ -1,6 +1,15 @@
 [tox]
 envlist = py27
 
-[py27]
-basepython = python2.7
-commands = coverage run --rcfile=./.coveragerc unit2 discover
+[testenv]
+deps=
+    unittest2
+    coverage
+    coveralls
+
+[testenv:py27]
+commands=
+    coverage erase
+    coverage run --rcfile=./.coveragerc -m unittest2 discover tests []
+    coveralls
+    coverage erase