handling the lazyloading request for dynaTree
lazyLoad the dynatree; added a new function to append the new nodes to existing node
Merge branch 'master' of https://github.com/molgenis/molgenis
The catalogue tree is lazy-loaded. When the top protocol is selected, all the data items need to be collected from server in order to show item selection. This process will be quick slow as it almost same as loading the whole tree in one goal
remove the redundant code and make a common method
Merge pull request #10 from ChaoPang/master

Lazy-loading catalogue tree
Merge branch 'master' of https://github.com/molgenis/molgenis
fix bug: do no generate 'mref entities' for imported entities