Some fix related to the commit aa528c9a6a692fa90c426c4fdb3757089

Convert ton int the default_max_age
Use = instance of : in the {development,production}.ini.in files
Update the apache/frontend.conf.in
Merge pull request #915 from camptocamp/headers-fix

Some fix related to the commit aa528c9a6a692fa90c426c4fdb3757089