Helper function to determine whether an object indicates StopIteration. #24
Implemented izip(). #15
Fixed examples in izip().
Implemented izip_longest(). #16
Fixed a couple of typos in iseq().
Implemented ifilter(). #8
Implemented ifilterfalse(). #9
Updated NEWS for ifilter and ifilterfalse. #8 #9
Updated Roxygen docs.
Implemented ienumerate(). #25

ienum() is an alias to ienumerate().
Implemented islice(). #10
Implemented icompress(). #5
Implemented itakewhile(). #14
Implemented idropwhile(). #6
Added missing export directives for iseq_along and iseq_len. #26
Implemented imap(). #11
Added imap() to NEWS. #11
Fixed some issues in the docs and tests for imap(). #11
Implemented istarmap(). #12

istar() is an alias to istarmap().
Merge pull request #27 from ramhiser/moar-iterators

Added several iterators from Python's itertools.