removing all features for bind expressions

bind parser code is lumped into a single file
[here](https://github.com/badair/bind_parser/blob/master/bind_parser.hpp)

This removes over 1000 lines of code from CallableTraits.

example/interface_example.cpp

@@ -19,6 +19,7 @@ int main(){ return 0; }
 //[ interface_example
 
 #include <iostream>
+#include <typeinfo>
 
 #include "interface.hpp"