Readme updates

Made a few changes based on things I noticed while setting up the project for the first time.
The reason I removed it from there was because it was redundant.  First the "required" dependencies are listed, then the "optional" which lists collab.  Next you say to install the above dependencies, which means the person will attempt to install collab (listed in required) without seeing your next note about which repo to use to install it.  If collab isn't listed in required, the person will still see the next step which says if you didn't install the optional collab, you still have to install the collab repo