Bug 881323 - Re-implement CycleCollectorParticipant with actual vtables, with constexpr to avoid static initializers. r=mccr8
Bug 899875 - Better handle empty arguments in pymake, and also treat whitespaces in bulk. r=ted
Bug 900775 - Add -std=gnu++0x to HOST_CXXFLAGS when not cross-compiling. r=gps