fix bugs and add tests for view::tokenize
Merge remote-tracking branch 'guoci/master' into guoci-tokenize-fix
tokenize test doesn't link with clang on cygwin
Merge pull request #80 from ericniebler/guoci-tokenize-fix

fix bugs and add tests for view::tokenize, fixes #79
view::join optionally accepts a value or a range to insert between joined ranges
temporarily disable joining on elements and ranges until Travis-CI problem is found. libc++ issue?
Merge remote-tracking branch 'upstream/master'