delete any old diff files before test starts. delete current file after test if the files are found to be the same. add check for existing files on file same result. add a standard browser size for all selenium tests in test_app.
add the changed set to the svg map. fix a zooka test expectation since the size of the window is different now.
had to adjust the same expectation value for travis runs.
Merge pull request #2 from QuantumGeordie/make_svg_of_changes

Make svg of changes