accomodate new boost::iterators namespace. See boostorg/iterator@dc96d371faf87a88c04057861136c9dfa68103d7
Merge pull request #17 from ericniebler/iterators-namespace

accomodate new boost::iterators namespace.
Merge remote-tracking branch 'origin/develop' into develop
Merge pull request #16 from ericniebler/develop

attempted fix for iterator_range relational operators bug
Hotfix to add back advance_begin and advance_end.
Add upgrade documentation about pop_front() and pop_back() being renamed.
Merge remote-tracking branch 'origin/develop' into develop
avoid SFINAE problem in iterator_range constructor