Added to .travis.yml colorama and prettytable python packages

Author: PrzemekWirkus

.travis.yml

@@ -3,3 +3,6 @@ install: "sudo $TRAVIS_BUILD_DIR/travis/install_dependencies.sh > /dev/null"
 python: 
   - "2.7"
 script: "python workspace_tools/build_travis.py"
+install:
+  - pip install colorama
+  - pip install prettytable