make the .{_format} optional when generating routes

[lsmith77]

see https://github.com/FriendsOfSymfony/FOSRestBundle/blob/master/Routing/Loader/Reader/RestActionReader.php#L195

ideally this would be configurable via some annotation and not a global flag to prevent different Bundles from requiring a different setting. imho since using format extensions isnt very RESTy, I would accept the BC break to set adding this to the pattern to off by default.

[eXtreme]

Any progress on that? It would be cool to get rid of _format automatically.

[lsmith77]

not aware on anyone working on this atm

[lsmith77]

thanks to #422 there is now a global flag for this .. not sure if we will bother with anything beyond that