remove numpy install from travis/tox scripts

travis builds could fail due to timeout building numpy

.travis.yml

@@ -5,7 +5,6 b' python:'
     - 2.7
     - 3.2
 before_install:
-    - pip install --use-mirrors numpy
     - easy_install -q pyzmq
 install:
     - python setup.py install -q 

tox.ini

@@ -8,12 +8,12 b' envlist = py26, py27, py32'
 
 [testenv]
 commands =
-    pip install -q --use-mirrors numpy nose
+    pip install -q --use-mirrors nose
     easy_install -q pyzmq
     iptest -w /tmp
 
 [testenv:py32]
 commands =
-    pip install -q --use-mirrors numpy nose
+    pip install -q --use-mirrors nose
     easy_install -q pyzmq
     iptest3 -w /tmp