Close GH-991: Fix Marionette Example to comply to spec 100%.
Update Marionette to not be Maroon
Merge pull request #992 from samccone/sjs/remove-maroon

Update Marionette to not be Maroon
Correct verb tense. 

The noun is plural ("practices"). The verb should match ("come").
Merge pull request #996 from janaspage/patch-1

Correct verb tense.
Update changelog
learn.template.json: correct indendation.
learn.template.json: update G+ boilerplate
learn.json: update Dart overview
learn.json: add Polymer on StackOverflow
learn.json: s/StackOverflow/Stack Overflow
Revisions to homepage for 1.3 release.