bump to 17.5
bump to 17.5

Not: With this release, the versionning of Gunicorn is changing.
Gunicorn is stable since a long time and there is no point to release a
"1.0" now. It should have been done since a long time. Also from the
beginning we have only 2 kind of releases:

- major release: releases with major changes or huge features added
- interval releases: fixes and minor features added

So from now we will apply the following versionning

    R<major>.<interval>

for example R17.5 means we are relasing an interval release on the 17th
major version.

alex/gunicorn,gtrdotmcs/gunicorn,wong2/gunicorn,gtrdotmcs/gunicorn,keakon/gunicorn,jamesblunt/gunicorn,1stvamp/gunicorn,z-fork/gunicorn,1stvamp/gunicorn,mvaled/gunicorn,wong2/gunicorn,ccl0326/gunicorn,gtrdotmcs/gunicorn,tempbottle/gunicorn,ephes/gunicorn,malept/gunicorn,mvaled/gunicorn,1stvamp/gunicorn,beni55/gunicorn,zhoucen/gunicorn,zhoucen/gunicorn,prezi/gunicorn,alex/gunicorn,jamesblunt/gunicorn,harrisonfeng/gunicorn,ccl0326/gunicorn,alex/gunicorn,ammaraskar/gunicorn,MrKiven/gunicorn,wong2/gunicorn,malept/gunicorn,ccl0326/gunicorn,mvaled/gunicorn,prezi/gunicorn,zhoucen/gunicorn,elelianghh/gunicorn,tejasmanohar/gunicorn,GitHublong/gunicorn,malept/gunicorn,prezi/gunicorn,jamesblunt/gunicorn,WSDC-NITWarangal/gunicorn