Install matplotlib & numpy in travisCI
apt-get install things if we can in travis CI
[travis.yml] Add scipy to pip installs
another vain attempt to fix travis

Install BLAS lib & gfortran to try fixing pip install scipy
Be less verbose in install in travis CI
Remove specifics from configuration.py

* timestream/manipulate/configuration.py (PCFGConfig.__init__): Use the
underscore "_" for internal variables so we can have subsections named
"configFile" and "depth".
(PCFGConfig.loadFromYaml): Configuration is just a structure that holds whatever
is on the path that it is handed. It reflects what is in a config file or what
is added through the methods. We should not add stuff that the caller does not
know about.
* util/pipeline_demo.py (plConf): We can add the confFile subsection after we
create plConf and it should have the same result.
Use the __str__ method from TimeStream.

* util/pipeline_demo.py (ts): print(ts) should print all relative information.
Remove unnecessary comments

* util/pipeline_demo.py: Remove all comments regarding previous context
variable.
Add selectRowTS to derandomize GUI.

Change the pixmap every time a timestream is selected in the ts list.
Also changed the internal variables in DerandomizeGUI to be prefixed by "_"
* util/derandui.py (selectRowTS): New method. Does the timestream selection and
takes care of the row coloring.
* util/derandui.ui: Make sure that the elements in the timestream table are not
selectable.