resolved most todo and recompiled most examples and tests

example/n1962/vector.cpp

@@ -53,7 +53,7 @@ public:
     vector() : vect_() {
         boost::contract::guard c = boost::contract::constructor(this)
             .postcondition([&] {
-                BOOST_CONTRACT_ASSERT(!empty());
+                BOOST_CONTRACT_ASSERT(empty());
             })
         ;
     }

example/n1962/vector_n1962.hpp

@@ -52,7 +52,7 @@ public:
 
     vector()
         postcondition {
-            !empty();
+            empty();
         }
         : vect_()
     {}