Stop using conda-forge

It helped get past the initial problem, but still fails for the Python
3.4 run. Hopefully standard conda with the updated conda and conda-build
will succeed...

.travis.yml

@@ -13,10 +13,10 @@ env:
     - secure: "gQ24XPFgPKmykrFxtyTwbKDV8GRoLkKn/PPUUJVbXuoep73XmDywY4fUs0yuwRx2quBZG18JlyCFgxzNKNSQNRCzF4rGnFfhNiOB/PlBB8+p3HhsPeeUnuHJvAh98mI2WRu93kNUnY7OByWNzyo3Qnpp63OgNmkT8Kp8Xu7CB0c="
 install:
   - source ci/travis/install.sh
-  - conda update -c conda-forge -y -n root conda
-  - conda update -c conda-forge -y -n root conda-build
-  - conda install -c conda-forge -y python=$TRAVIS_PYTHON_VERSION
-  - conda install -c conda-forge -y coverage nose mock
+  - conda update -y -n root conda
+  - conda update -y -n root conda-build
+  - conda install -y python=$TRAVIS_PYTHON_VERSION
+  - conda install -y coverage nose mock
   - pip install codecov
   - pip install coveralls
   - conda build --python=$TRAVIS_PYTHON_VERSION conda.recipe