Add a basic web test application
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Added a new test application which uses a new vtkweb module, vtkweb.testing. The application provides a mechanism for adding protocol tests (in Javascript) or other web tests, as well as an interface for selecting tests to run and viewing the test results.
Also updated a Python selenium test which interacts with the new application and reports any failures via ctest.