add hyperlinking for html and css
nits
moved files
#2248: improved all git dialogs
fix an issue with spark not starting up
fix an issue with spark not starting up
Merge pull request #2367 from devoncarew/devoncarew_fix_startup

Devoncarew fix startup
Move treeDiff code as a separate command.
cleanup.
Make checkout use Diff.diffTree instead of merge.diffTree.
fix a cce in pub
cleanup git merge.
fix visibilit issues in the outline view
fix a dialog title issue
review comments
Merge pull request #2369 from devoncarew/devoncarew_outline_visibility

fix visibility issues in the outline view
Add recursive tree diffing.
cleanup.
Addressed comments.
Merge pull request #2370 from dart-lang/refactor_git_merge

[Refactor] Refactor git merge