Feature/autogenerate

This pull request add a scripts directory with the generate_sdk_methods.py script and readme included. The script auto generates the SDK methods in the folder canvas_sdk/methods. The auto generated files are also included but should be ignored for the code review. The file to be reviewed is really only the generate_sdk_methods.py. 
technically the script can be run from any place, it will check to see if the relative path canvas_sdk/methods directory exists or not and created it if needed before creating files. I will add that to the readme doc.