Merge tag 'v1.1.0'

v1.1.0
doc: add CONTRIBUTING.md and LICENSE.md
README: list features, explain diff from npmrc

Update the README to reflect the new `promote` command.

Add a list of features and a FAQ section explaining the difference
between strong-registry and npmrc.
Merge pull request #10 from strongloop/feature/improve-readme

README: list features, explain diff from npmrc
Update package license to match LICENSE.md
Rename strong-cli to strongloop
v1.1.1
Merge branch 'release/1.1.1' into production