Merge pull request #34 from financeCoding/master

Adding missing import and fixing up tool/hop_runner.dart
Big cleanup

Signed-off-by: John McCutchan <john@johnmccutchan.com>
Merge branch 'master' of https://github.com/johnmccutchan/spectre

Signed-off-by: John McCutchan <john@johnmccutchan.com>

Conflicts:
	lib/spectre_scene.dart
	pubspec.yaml
Fix pubspec.yaml

Signed-off-by: John McCutchan <john@johnmccutchan.com>