Adapt tests for tree/LayerContainer to work w/ ExtJS 4 and 5
Adapt tests for tree/LayerContainer to work w/ ExtJS 4 and 5

Since the tree package has changed in ExtJS 5 the tests for the GeoExt
tree-LayerContainer class are adapted herewith.
Now they pass with ExtJS 4.2.1 and 5.1.0.

chrismayer/geoext2,geographika/geoext2,bentrm/geoext2,marcjansen/geoext2,m-click/geoext2,annarieger/geoext2,bentrm/geoext2,marcjansen/geoext2,annarieger/geoext2,geoext/geoext2,geographika/geoext2,geoext/geoext2,m-click/geoext2,chrismayer/geoext2