Fix EOL of messages.json
TabView
Fix stylesheet to comply to Style Guide
Fixes a race condition;
Introduced an `openOnSelection` option in FilesController
Auto hide tab bar.
Fall back theme to fix theme changing
Decouple TabView from EditorManager
Bug fix
Fix comments
initial mock file system
Adding config to disallow tabs
Rename lastSelectedEditor to lastFileSelection with bug fixes
Fixes a race condition
Fix nits and remove start indicators
Merge pull request #224 from dart-lang/filesmock

initial mock file system
Merge pull request #215 from ikarienator/TabView

Introducing TabView
addressed comments
added recursive add/remove methods
resolve merge conflicts