Returned lodash-es

Bundling mobx and lodash inside the UMD bundle

Updated api and docs

Not showing virtual scroll unless enabled
Added treeModel to events
Fixed getActiveNodes & getExpandedNodes

Updated lib name

Merge branch 'master' of github.com:500tech/angular2-tree-component

Using ng2-mobx's wrappers for observable and computed for AoT

Fix lint errors

Fix ng2-mobx version

Fixed release date

Merge branch 'master' of github.com:500tech/angular2-tree-component

Update tsconfig / package.json