added screencast docs. still need to add images
Merge github.com:GoogleChrome/devtools-docs

* github.com:GoogleChrome/devtools-docs:
  Correcting TOC entrt for native usb debugging
  Adds first updates for native usb debugging
remove empty tag
updates made to the screencast docs. added screenshots
merge conflicts
updated the doc, better screenshots, and should be complete
final edits to screencast
merged conflicts
added Opt+Delete to Sources shortcuts
merge conflicts
Merge github.com:GoogleChrome/devtools-docs

* github.com:GoogleChrome/devtools-docs:
  update remote-debug image.
  big remote debug rework.
  DOM and Styles - use SVG for the Icons instead of Icon Fonts
  fix in-page hash links for console API. thx @davidcalhoun
issues #19 and #5 cuz we love shortcuts
re-adding something i didnt mean to delete
Adds DevTools Extensions gallery
Formatting tweaks
Merge github.com:GoogleChrome/devtools-docs

* github.com:GoogleChrome/devtools-docs:
  fixing the inline video.
  no more console.profiles
  adb binary if you need it.
  adding youtube embeds.
  windows callout done in a p.note
  7 tap video for remote debugging docs.
  squeeze the images.
  redirect, toc, and homepage updates for DOM&Styles.
  dom and styles. published live. here's the latest.
  Squashed commit of the following:
  remote debug. fix TOC and add troubleshooting section.
  Adding mirror note to readme.
Add in retina inspect icon
Add in a HTML version of DOM and styles
new icons for shortcuts doc. deleted old ones
Update the breadcrumb images to retina.