Changed travis test structure; Added lint test

.travis.yml

@@ -6,6 +6,11 @@ language: python
 os:
     - linux
 
+env:
+    matrix:
+        - TASK=lint
+        - TASK=python-test
+
 cache:
     apt: true
     directories:

scripts/run_tests.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ${TASK} == "lint" ]; then
+    if [ ${TRAVIS_OS_NAME} != "osx" ]; then
+        make lint  || exit -1
+    fi
+fi
+
+if [ ${TASK} == "python-test" ]; then
+	nosetests
+fi