TEMP: Trying to add markers with hover-ability.  No luck
Reverting last attempt (using markers).
TEMP: setting up ace.dart locally and testing linking
Resolved conflicts
Hovering events are working.  Temporary implementation of markers
Cleaned up
Merge branch 'master' of https://github.com/dart-lang/spark into umop-hyperlink-hover_hack
Constraining ace to next version
Setup bottom-border marker for underline-like behavior.  Also, turning mouse cursor to pointer when ACCEL'ing over an identifier.
Review fix
Only hover on dart files
Review nit
Merge branch 'master' of https://github.com/dart-lang/spark into umop-hyperlink-hover
Merge pull request #2660 from dart-lang/umop-hyperlink-hover

Hyperlink underline on ACCEL + <hover> of identifier