Merge branch 'develop' of github.com:yahoo/mojito into develop
Merge branch 'develop' of github.com:yahoo/mojito into develop
Merge pull request #1032 from isao/cli2

cleanup how the cli is invoked a bit
Merge branch 'develop' of github.com:yahoo/mojito into develop
Fixed a bad screenshot.
Merge pull request #1034 from zhouyaoji/docs_update_ex_image

[doc] Fixed screenshot for an example and modified documentation explaining the screenshot.
upgrading to yui 3.9.0
updating history notes
no longer forcing arrow to use a specific yui version, relying on the default one shipped with arrow which is 3.6.0 at the moment.
Merge pull request #1035 from caridy/yui-390

upgrading to yui 3.9.0
post-install check to post `npm i -g mojito` deprecation message