Removed the composition specifications (which haven't been implemented yet)...

Removed the composition specifications (which haven't been implemented yet) from our examples folder.

examples/nsldb.psl

-spec NSL;DB is
-    composing NSL ; DB .
-    A ;1 B : A |-> B,  B |-> A, N |-> n(A, r) .
-    B ;1 A : A |-> B, B |-> A1, N |-> NA1 .
-
-Attacks
-    0 .
-        B.NSL executes up to 2 .
-        Intruder learns n(B.NSL, r1) .
-        //Tells us how we should instantiate the attack strand.
-        Subst(B.NSL) = B |-> b, A1 |-> a .
-ends
-

examples/nslkd.psl

-spec NSL;KD is
-    composing NSL ; KD .
-
-    //nsl-A ;* kd-B kd-A
-    nsl-init ;* kd-resp : A |-> B,  B |-> A, K |-> h(n(A, r) ; NB), K2 |-> key . 
-    nsl-init ;* kd-init : A |-> A,  B |-> B, K |-> key, K2 |-> h(n(A, r) ; NB) .     
-    nsl-B ;* kd-A : A |-> B, B |-> A1, K |-> h(NA1 ; n(B, r1)) .
-    nsl-B ;* kd-B : A |-> A1, B |-> B, K |-> h(NA1 ; n(B, r1)) .
-ends