Allow users to register cache handlers with SimplePie_Cache.
Allow users to register cache handlers with SimplePie_Cache.

Instead of overriding SimplePie_Cache, you can now register your handler
directly with it. This is done by registering a prefix (the part of the
location before a colon) with a class to be instantiated as the cache
object. This class must implement the SimplePie_Cache_Base interface,
and this will be inforced in a later version of the code.

blat/simplepie,skyzyx/simplepie,Alkarex/simplepie,blat/simplepie,ropik/simplepie,skyzyx/simplepie,songfj/simplepie,wikidi/simplepie,barryvdh/simplepie,FreshRSS/simplepie,barryvdh/simplepie,simplepie/simplepie,blat/simplepie,ropik/simplepie,wikidi/simplepie,songfj/simplepie,barryvdh/simplepie,songfj/simplepie,Alkarex/simplepie,simplepie/simplepie,FreshRSS/simplepie,mblaney/simplepie,wikidi/simplepie,mblaney/simplepie,Alkarex/simplepie