Fix posts discovery.
Fix posts discovery.

For PHP before 5.5, the bridge is not working. It returns the following error: "Can't use method return value in write context".
See the following message for explanations: http://stackoverflow.com/questions/1075534/cant-use-method-return-value-in-write-context/4328049#4328049

mro/rss-bridge,Riduidel/rss-bridge,teromene/rss-bridge,griffaurel/rss-bridge,Nyutag/rss-bridge,polo2ro/rss-bridge,GregThib/rss-bridge,simonbru/rss-bridge,kranack/rss-bridge,simonbru/rss-bridge,Riduidel/rss-bridge,ORelio/rss-bridge,Frenzie/rss-bridge,RSS-Bridge/rss-bridge,teromene/rss-bridge,RSS-Bridge/rss-bridge,ORelio/rss-bridge,kranack/rss-bridge,mro/rss-bridge,inscriptionweb/rss-bridge,LogMANOriginal/rss-bridge,kranack/rss-bridge,sebsauvage/rss-bridge,RSS-Bridge/rss-bridge,ORelio/rss-bridge,LogMANOriginal/rss-bridge,kranack/rss-bridge,Frenzie/rss-bridge,Riduidel/rss-bridge