Working PHP!

Important!!! These pages load via POST request, so they only function
correctly when they return a valid request from the db.
- AddCust links to EditCust via search
- AddInv links to EditInv via search
- AddUser links to EditUser via search

JavaScript/JQuery and CSS are not currently in use, but they will be
shortly so I’ve already included them. It may or may not error if they
aren’t included in the mySQL folder.

I also made some more changes to the Relational Schema… they should be
good now? I honestly can’t remember exactly what changed but Git says
it did.
Merge branch 'master' of https://github.com/vinyaa/is2710

Conflicts:
	docs/Relational Schema.docx
Documentation Updates

I hope this is update is doing the right thing… not quite sure what
happened when I tried to commit.