Contract factories and bytecode introspection (#305)

* Support for CREATE, CLONE and BYTECODE_HASH

* Add missing files

* Pushed the clone example through the typechecker

* CLONE compiles

* Fix dependent type in CLONE

* Bytecode hash fixes

* Refactor

* Refactor 2

* move some logic away

* Fixed some error messages. Type inference of child contract still does some random shit\n(mistakes arguments with result type)

* CREATE sometimes compiles and sometimes not

* Fix some scoping/constraint issues

* works, needs cleanup

* cleanup

* Fix some tests. Remove optimization of singleton tuples

* Fix default argument for clone

* Cleanup

* CHANGELOG

* Mention void type

* Address review, fix some dialyzer errors

* Please dialyzer

* Fix failing tests

* Write negative tests

* Docs

* TOC

* missing 'the'

* missing 'the'

* missing 'the'

* missing 'the'

* mention pre-fund

* format

* pre-fund clarification

* format

* Grammar in docs

priv/stdlib/List.aes

@@ -208,10 +208,13 @@ namespace List =
     []   => false
     h::t => if(p(h)) true else any(p, t)
 
-  function sum(l : list(int)) : int = foldl ((a, b) => a + b, 0, l)
-
-  function product(l : list(int)) : int = foldl((a, b) => a * b, 1, l)
+  function sum(l : list(int)) : int = switch(l)
+    []   => 0
+    h::t => h + sum(t)
 
+  function product(l : list(int)) : int = switch(l)
+    []   => 1
+    h::t => h * sum(t)
 
 /** Zips two list by applying bimapping function on respective elements.
  * Drops the tail of the longer list.