Changes since 0.1.1
1. slruby.sl: SLang.method_missing was defining instance methods instead of module
   methods
2. rb_complete.rb: added instance method completion for "Foo.new.b" cases
3. slruby.sl: Added instance method_missing function.
Changes since 0.1.0
1. Added support for passing longs, ulongs, llongs and ullongs to Ruby
