Add repository information to package.json

[Turbo87]

so that it shows on https://www.npmjs.com/package/ember-load-initializers and so that GreenKeeper is able to show more information

[rwjblue]

closed by 5c81fc6

[Turbo87]

@rwjblue did you see #35?

[rwjblue]

Apparently not 😿