added template default arguments for iterator_facade - Reference and Difference - to match boost::iterator_facade
Merge remote-tracking branch 'original/master'
removed template default argument for Reference in iterator_facade
Merge pull request #448 from StephanDollberg/master

added template default arguments for iterator_facade - Reference and Dif...
Merge pull request #453 from jaredhoberock/bulk

Update to latest Bulk
Workaround nvcc's interaction with gcc 4.8's new -Wunused-local-typedefs.