port PACProxyHandler to SimpleProxyHandler
shorten FORWARD/URLFETCH/STRIPSSL/MOCK
add GreenForwardMixin for uvent socket forward
refine GAEFetchFilter and add PHPProxyHandler2
refine PHPProxyHandler2
add handler.host to filter
refactor RC4FileObject to CipherFileObject
refine URLFETCH
rename connection_cache_key to cache_key
refine HostsFilter
refine Filters with handler.host/handler.port
bugfix for STRIPSSL
bugfix for gae handler2
add StopProxyHandlerFilter
add AutoRangeFilter
refine URLFETCH
refine URLFETCH
add RangeFetch2
add handler.body
draftly done