reorg for Intellij

Intellij allows one to exclude directories of sources from one's code. As rdflib used to be made one ended up with a lot of duplicated source js files, and duplicate js and coffee script sources. As a result asking intellij to jump to methods ( which is an important way for a newbie to explore code) became quite tedious, as one had to constantly ask the editor to choose which files one wanted by default.
Also started adding documentation to coffee scripts.