Added separator test before implementing
Changed example
Setup temporary styling (red background) for separator.  Height override is not working.
Merge branch 'master' of https://github.com/dart-lang/spark into umop-polymer-menu_separator
First stab at spark-menu-separator files (will probably remove these) and inclusion into example.
Removed separator files
Revert "Setup temporary styling (red background) for separator.  Height override is not working."

This reverts commit 0431888cfe07095cf8287c4c1b7a568cfd86efc0.
Added separators to spark
tweaked and cleaned up
Restored spark_menu_separator files and stripped
Merge branch 'master' of https://github.com/dart-lang/spark into umop-polymer-menu_separator
Merge pull request #790 from umop/umop-polymer-menu_separator

Polymer menu separator