Fixes Spec issue #11

Conflicts:
	Spec-Core.package/monticello.meta/version
Remove useless 'contents' variable in SpecTreeNodeModel
Merge pull request #12 from DamienCassou/issue-11-auto-refresh-tree-on-expand

Issue 11 auto refresh tree on expand
Add an example on `TreeModel` about `autoRefreshOnExpand`
Merge branch 'master' into transfer

Conflicts:
	Spec-Core.package/monticello.meta/version
	Spec-MorphicAdapters.package/monticello.meta/version