edit pass on T3,4,5, updated images

making instructions for running an app more clear, as per feedback from John Graves

updated connect-dart-html for 1.0

updated get-started tutorial for 1.0

hosting apps from site rather than github

moving hosted clickme app to this repo instead of github

somehow the source graffle doc was missing for the top banner. rectified.

commented out multi-select, updated banner and title

removing term target, also changing URLs to the examples

removing the term target

BUG=
R=kathyw@google.com

Review URL: https://chromiumcodereview.appspot.com/26542002