update salaam, fake bignum

Since the interpreter is fixed and uses lignum, some solution
for opal is needed.  Currently hacked

Gemfile.lock

@@ -30,7 +30,7 @@ GIT
 
 GIT
   remote: git://github.com/salama/salama.git
-  revision: f11e8f0a13e9f2725fa028899c3270d481086add
+  revision: 64d99d5e68f2ad512210ae64b33d6f1c1eddc1ec
   specs:
     salama (0.3.0)
       salama-object-file (~> 0.3)

lib/debugger.rb

@@ -18,7 +18,8 @@ require "views/status_view"
 require "views/source_view"
 require "views/instruction_view"
 require "views/registers_view"
-
+class Bignum
+end
 class MainView < ListView
   include AST::Sexp