add university

examples/university.spec

+Workflow
+
+forallmay p:Prof,s:Student,g:Grade
+    (O(p,s,g)) -> Grading += (p,s,g)
+forallmay p:Prof,t:TA
+    True -> Talk1 += (t, p)
+forallmay t:TA,s:Student
+    True -> Talk2 += (s, t)
+
+Declassify
+
+O(p:Prof,s:Student,g:Grade): True
+
+Target
+
+Talk2(as:Student, at:TA)
+
+Causality
+
+cta:TA, cp:Prof