Revert "include osx in travis build"

.travis.yml

@@ -1,20 +1,14 @@
-
-matrix:
-  include:
-    - os: osx
-      language: generic
-      before_install:
-        - brew update
-        - brew install libxml2 qt qt4 pyqt5
-    - os: linux
-      dist: trusty
-      sudo: required
 language: python
-      python: 2.7
+python:
+  - "2.7"
+
 addons:
   apt:
     packages:
     - cmake
     - pyqt4-dev-tools
 
+# command to install dependencies
+#install: "pip install --user -r requirements.txt"
+# command to run tests
 script: make all