Merge Adorable master to LMHT master (deploy)

[ericanaughton]

:tea:

Done

• Redesigns the Contribute ribbon
• Removes .html from the end of URL's for elements
• Fixes example for LINK tag
• Fixes minor style issues
• Adds linter
• Adds Travis CI
• Removes logo from sticky nav when screen is smaller
• Fix welcome page

[bigtiger]

:+1:

[kathyoleary]

Welcome page fix done https://github.com/adorableio/LMHT/pull/39. If you bring this in on it, you can deploy