With permission of Johan, discourse_sso_node is now MIT licensed!

With permission of Johan, discourse_sso_node is now MIT licensed!
- Added a LICENSE file, a license property to package.json, and a license section to the readme.
- Bumped version number from 1.0.1 to 1.0.2

References Issue https://github.com/ArmedGuy/discourse_sso_node/issues/3