Changed link to github.com/mitodl/mit-lti-flask-sample
made the terminal commands 'copy-and-paste' as recommended.
Rewrote QuickStart commands to allow copy-paste operation, on Carson's suggestion
Removed call to run.sh script
Merge pull request #11 from mitodl/fix_github_link

Changed link to github.com/mitodl/mit-lti-flask-sample