hcar update.
Merge pull request #21 from RyanGlScott/master

Replace deprecated sourceCmd with sourceCmdWithConsumer
Merge branch 'master' of github.com:kazu-yamamoto/cab
doctest again.
travis settings.
tyring to fix travis.
Revert "tyring to fix travis."

This reverts commit 2fc2b2b02b08a423b4107482949e931e05debab2.
adding limitations.
Added cab get, made unpack alias
Tweaked outdated, added --future switch