Added python-lxml in dependencies.

.travis.yml

@@ -30,10 +30,10 @@ before_script:
     - sudo apt-get install libhdf5-serial-dev
     - sudo apt-get install python-numpy python-setuptools python-networkx python-pip
     - sudo apt-get install cmake cdbs
-    - sudo apt-get install python-suds python-matplotlib python-nose
+    - sudo apt-get install python-suds python-matplotlib python-nose python-lxml
     - sudo apt-get install python-qt4-dev python-qt4-gl python-sip-dev libqt4-dev libopenscenegraph-dev
-    - sudo apt-get install doxygen python-sphinx
-    - sudo apt-get install git-buildpackage
+    - sudo apt-get install doxygen python-sphinx 
+    - sudo apt-get install git-buildpackage 
 
 install:
     - wget http://ftp.debian.org/debian/pool/main/g/gsl/libgsl0ldbl_1.16+dfsg-2_amd64.deb -O gsl_1.16.deb