v0.15.1
Remove incorrect call to pdb in ``backports.http.client`` (issue #164)
Merge branch 'master' into v0.14.x
Also expose HTTPMessage in ``future.moves.http.client``
install_aliases(): expose the full backported urllib modules instead of the Py2 aliases (issue #158)
Py2.6 compatibility: use 3-argument create_connection() from future.backports.socket (issue #162)
future.utils: add string_types etc. and clean up docs (issue #126)
Bump version to v0.15.1