Bug 1071615.  Make codegen fail when "A implements B" appears on a Web IDL file different from the file A is defined in. r=khuey
Bug 1070764.  Don't try to use the uninitialized temp value while default-constructing a dictionary with a required member.  r=khuey
Bug 1030192 part 1.  Make sequences distinguishable from dictionaries and callbacks in the Web IDL parser.  r=khuey
Bug 1030192 part 2.  Codegen changes to handle cases when a sequence is actually overloaded with a dictionary.  r=khuey