SAK-25514 adding chat module

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@315639 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25514 adding chat to tool.scss

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@315640 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25514 adding chat js file

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@315641 66ffb92e-73f9-0310-93c1-f5514f145a0a