Remove explicit font-size's where they coincided with the default
Fix bug in loading the objectstore.
Revers attribute name: enabled -> disabled, to match standard HTML one
Merge pull request #2076 from dart-lang/branch_bug

Fix bug in loading the objectstore.
Merge pull request #2077 from ussuri/improve-font-rendering

Remove explicit font-size's where they coincided with the default
Merge pull request #2078 from ussuri/enabled-disabled-for-spark-button

Revers attribute name: enabled -> disabled, to match standard HTML one
Revers attribute name: enabled -> disabled, to match standard HTML one (reverted from commit 517614c2b8faaebda284d0d7a07739a82abe395f)
Merge pull request #2079 from ussuri/enabled-disabled-for-spark-button

Revers attribute name: enabled -> disabled, to match standard HTML one
Implement markdown editor and preview window.