Removed payload from event coordinator since we are going to be using kontx.
Changed remove function to 'off' and added documentation.
Added documentation.
Had to add 'toString()' to all ids coming in since there is a chance someone passes in an object.
removed debug statement.
Added middleware to set event filters from the temporary _content object.
Finished content events
Merge branch 'master' of https://github.com/Solid-Interactive/grasshopper-core-nodejs