support more possible values of Cache-Control header
Clean up CookieJar, close #1304
Upgrade AHC 1.7.19.20130724
Add ChainBuilder.empty
Add a simulation max duration, close #1307
Minor clean up
Init TimeHelper
fast maxAge value checking
Minor clean up
Merge pull request #1308 from nremond/cache_control

Caching mechanism should take into account the Cache-Control header