[resources] Add osx dependency script

Author: mpsonntag

resources/install_osx_virtualenv.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+echo Running install_osx_virtalenv.sh
+
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+
+    brew update;
+
+    if [[ "$OSXENV" == "2.7" ]]; then
+        brew install python;
+        virtualenv venv -p python;
+        source venv/bin/activate;
+    else
+        brew install python3;
+        virtualenv venv -p python3;
+        source venv/bin/activate;
+    fi
+fi
+
+which python