fix an npe when generating samples
Merge pull request #155 from devoncarew/devoncarew_fix_npe

fix an npe when generating samples
don't report analytics exceptions
Merge pull request #156 from devoncarew/devoncarew_fix_exception

don't report analytics exceptions
Merge pull request #154 from wibling/master

Add a Dart for AppEngine hello world sample application to StageHand.
tweaks to the appengine sample
some whitespace changes
Merge pull request #159 from devoncarew/devoncarew_whitespace

some whitespace changes
Merge pull request #158 from devoncarew/devoncarew_appengine

tweaks to the appengine sample
Add a library directory and content to showcase the lib layout.

Also added back the Dockerfile which went missing in a previous patch.