Make cookies configurable.
Make cookies configurable.

This simple change provides ability to change cookie parameters like age, name.

Tested on internal server. Two instances of RB 1.7beta2 have been deployed
thanks to virtualenv on same hw:
 * first is production environment located at "reviewboard.mycompany.com"
 * second is test environment located at "reviewboard.mycompany.com:8001"

Reviewed at http://reviews.reviewboard.org/r/3391/

1tush/reviewboard,1tush/reviewboard,reviewboard/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,brennie/reviewboard,1tush/reviewboard,davidt/reviewboard,beol/reviewboard,KnowNo/reviewboard,davidt/reviewboard,sgallagher/reviewboard,davidt/reviewboard,custode/reviewboard,1tush/reviewboard,KnowNo/reviewboard,KnowNo/reviewboard,chipx86/reviewboard,chipx86/reviewboard,chipx86/reviewboard,brennie/reviewboard,custode/reviewboard,KnowNo/reviewboard,bkochendorfer/reviewboard,1tush/reviewboard,sgallagher/reviewboard,beol/reviewboard,1tush/reviewboard,reviewboard/reviewboard,sgallagher/reviewboard,beol/reviewboard,brennie/reviewboard,bkochendorfer/reviewboard,1tush/reviewboard,custode/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,custode/reviewboard,davidt/reviewboard,brennie/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,beol/reviewboard,reviewboard/reviewboard,chipx86/reviewboard