incorrect npm url in install templates

[jzjzjzj]

Example.

Cases.
npmjs.org should be replaced with https://www.npmjs.com/.
Also - https://npmjs.org/doc/json.html should be replaced with https://docs.npmjs.com/files/package.json.

Won't send PR cause of #3.

[jonschlinkert]

wow, that sucks lol. thanks for letting me know!