compiling examples for doc started

examples/compiling/Compex.gf

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+abstract Compex = {
+  cat Prop ; Ind ;
+  fun Even : Ind -> Prop ;
+}

examples/compiling/CompexEng.gf

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+concrete CompexEng of Compex = open MathematicalEng, ParadigmsEng, Prelude in {
+  lincat 
+    Prop = {s : Bool => Str} ;
+    Ind  = NP ;
+  lin 
+    Even : Ind -> Prop ;
+
+}