Added cdbs to build dependency Travis was failing

.travis.yml

@@ -28,7 +28,7 @@ before_script:
     - sudo apt-get install libxml2-dev libbz2-dev wget
     - sudo apt-get install libhdf5-serial-dev
     - sudo apt-get install python-numpy python-setuptools python-networkx
-    - sudo apt-get install cmake
+    - sudo apt-get install cmake cdbs
     - sudo apt-get install python-suds python-matplotlib
     - sudo apt-get install python-qt4-dev python-qt4-gl python-sip-dev libqt4-dev libopenscenegraph-dev
     - sudo apt-get install doxygen python-sphinx