Issue 1836 creating content utils

JT, this is what we talked about this morning. I made the changes in ContentTool to call the new class ContentUtils. ContentUtils does all the work and returns a list of contentlets or a contentlet to the ContentTool, the content tool wraps the result in a ContentMap.

All I did was copy / paste the existing code from master and move the logic of each method to the Content Utils.

I tested locally and it works but of course this needs to be tested. 

I hope it's a good change. 

Thanks
Maru