MDTraj requires numpy installed before attempting install

.requirements-full-test.txt

-numpy
 scipy
-simpletraj
 mdtraj
 mdanalysis
 pytest

.travis.yml

@@ -10,6 +10,7 @@ cache:
         - $HOME/.cache/pip
 install:
     - pip install --upgrade pip setuptools wheel
-    - pip install -r .requirements-full-test.txt --only-binary=numpy,scipy
+    - pip install -r requirements.txt --only-binary=numpy
+    - pip install -r .requirements-full-test.txt --only-binary=scipy
 script:
     - py.test test/

requirements.txt

-coverage==4.0.3
-nose==1.3.7
-numpy==1.10.4
-py==1.4.31
-pytest==2.8.7
-simpletraj==0.3
-wheel==0.29.0
+numpy
+simpletraj