Adds wrapper.py.
Implements cookie support (closes chfoo/wpull#6).
changelog.rst: Adds cookies. Updates terse_options.rst.
wrapper.py: Fixes Python 2 compatibility.
backport.urlparse.py: Fixes syntax error warning.
options.py: Turns off robots if not recursive (closes chfoo/wpull#28).
http: Removes connection ready queue (chfoo/wpull#27).

Can't tell if connection ready queue or the semaphore is buggy. Using a
for loop isn't that expensive anyway.
changelog: Updates latest to 0.17.
Merge commit '334da'
Bumps version to 0.17.