ADD: MergeAdjacentImages notebook in Examples/
ADD: First README.md draft
Update README.md

Added draft of README.md file of how to setup the environment for running IPython notebooks.
ADD: README.md file added to MergeAdjacentImages example.
Merge remote-tracking branch 'upstream/master' into MergeAdjacentImages-Notebook
ADD: Testing functionality for IPython notebooks.

     This is a draft for testing functionality of IPython notebooks.
     The idea is to set up a Python virtual environment, install all
     required packages there and then run the IPython notebook. In
     case the notebook runs without problems, we should in principle
     get an exit code of 0 from evalipnb.py and the test was fine.

     TODO: Make testing functionality for Examples/Use-Case notebooks
     available as an option during configuration, since installation
     of all the required Python packages while setting up the virtual-
     env might take a while.
ENH: Renaming and conditional testing.
ENH: Update README.md

README.md now contains instructions of how to run IPython notebooks with the autmatically set up virtual environment (in case BUILD_TESGING is ON)
ENH: Typo fixes in documentation.
ENH: Moved Python utilities within Utilities into Python directory.
Merge remote-tracking branch 'upstream/master' into MergeAdjacentImages-Notebook
ENH: Make TubeTK Examples testing dependable on TubeTK_TEST_EXAMPLES

     Added an advanced option TubeTK_TEST_EXAMPLES that is OFF by
     default. If ON, then the Python virtual environment will be
     set up and the IPython notebooks in the Examples folder can
     be tested.

     Also adjusted the README.md file and switched back and forth
     between installing matplotlib with pip or easy_install.
ENH: Incorporated Matt's review comments;

     - foreach loop in CMakeLists.txt to install Python packages.
     - Corrected typo in Superbuild CMakeLists.txt
     - Introduced PYTHON_TESTING_EXECUTABLE
Merge pull request #80 from rkwitt/MergeAdjacentImages-Notebook

Draft for setting up Python virtualenv in cmake and IPython notebook testing.