fixed license url
clarify ENOENT on npm install for new users
fixed typo in comments of manage.scss

The mage posts screen is probably supposed to be the manage posts screen.
Merge pull request #1138 from LegitTalon/patch-1

fixed typo in comments of manage.scss
Merge pull request #1123 from sjama/package.json

fixed license url
Merge pull request #1134 from luk-/doc-enoent

clarify npm install step to help new npm users