Adding a quick stab at the TTS version of the installed application
Removing the lasterror, checking on the events.
Make the in-app payments sample a bit more flexible by allowing the user to specify their own JWT.
don't have a default jwt for production
Update clock dart packaged app example for a modern dart.

This change allows the clock to run in Dartium m31, or in Chrome,
without changes.

Changes:
 dart2js no longer accepts --disallow-unsafe-eval
 window.requestLayoutFrame is now scheudleMicrotask from dart:async.
 Date is now DateTime
 List<E>.filter is now List<E>.removeWhere
 String.charCodeAt is now String.codeUnitAt
 js/interop stuff no longer required

Bugfix: Fix numbers not showing up at all when first opened, e.g., at
exactly 4pm and now.minute == 0.

Review URL: https://codereview.appspot.com/56440043
Changed tts name
Addressed Mike's feedback
Fixed lots of nits
Add some comments for windows users.
Added Web Store Sample App
Added assets and fixed nits
Added Window Options Sample
Added Web Store Edit URL to each project card
Added error console
Merge pull request #216 from GoogleChrome/addWebStoreSampleApp

Add web store sample app
changed calculator sample to use CSS instead of fixed images; removed 300ms delay on button clicks; allow calculator window to resize, using flexboxes
Added clear example

Notification will go away after 3 seconds
Updated screenshots Rich notifications
fixed name of web-store screenshot
Added web-store sample to README.md