Translation: /fundamentals/performance/index.markdown
Check for null to avoid issue #848
Added Add to home screen guide to Device Access, renamed Device Access to Device Access & Integration
Merge pull request #849 from jacquerie/master

Check for null to avoid issue #848
Fixed translation of 'full-bleed'.
Add compass to the Gemfile, fixing issue #846
Add instruction to run npm install, fixing issue #852
Merge pull request #855 from cwdoh/update.tweak.awkward.getting-started

Fixed translation of 'full-bleed'.
Update adding-interactivity-with-javascript.markdown

Changed updated date to September 18.
Update measure-crp.markdown

Changed updated date to be September 18.
Update render-blocking-css.markdown

Changed last updated date to be September 18.
Update render-tree-construction.markdown

Changed last updated to be September 18.
Update monitor-location.markdown

Changed updated on date to be September 18.
Update dev-orientation.markdown

Changed updated on date to be September 18.
Update click-to-call.markdown

Changed updated on date to be September 18.
Update user-consent.markdown

Changed updated on date to be September 18.
Update obtain-location.markdown

Changed updated on date to be September 19.
Update explore.markdown

Changed updated on date to be September 19.
Update finish-on-another-device.markdown

Changed updated on date to be September 19.
Update guest.markdown

Changed updated on date to be September 19.