Remove canvas_course_creation from ext_tools project and instead include...

... django-canvas-course-site-wizard (same code) from external repo.  Update requirements files to include dependency.  Update name of module for url inclusion and add newly named wizard to list of installed apps.  Add some lines to .gitignore that will allow for developers to have their own requirements file for local development (in order to be able to include local directories).
What the above lines do is only exclude any additional .txt files in the requirements folder, while maintaining the list of files we already have in place.  That way, you could add a file called "sapna.txt" to the requirements folder that has specific includes you want to test and it will be ignored by git.