Add SparkError class to handle error and exceptions.
rename errorString to errorcode.
resource notification changes
Fix to issue #1301

...
quick

fix to bracing style...overlooked how the rest were set up.
Inconsequential adjustments in widgets
wip
Merge branch 'master' into devoncarew_polymer_investigation
polymer hacks
Merge pull request #1540 from devoncarew/devoncarew_polymer_investigation

Devoncarew polymer investigation
Merge remote-tracking branch 'upstream/master' into small-fixes
upgrade cipher to the latest version
Merge pull request #1542 from devoncarew/devoncarew_upgrade_cipher

upgrade cipher to the latest version
0.9.0 -> 0.10.0
Switched attribute to camelCase...(issue #1301)
Merge pull request #1543 from rnirnber/master

Fix to issue #1301
Fixed spark-split-view breakage in Chrome 36
fixed comments.
Merge remote-tracking branch 'origin/master' into add_error_handling
Fix error with renaming spark_error.dart file.