SHINDIG-420 Patch from Erel Segal. Updates the php readme file to remind people to change config/container.js with their social api url prefix value. 
SHINDIG-420
Patch from Erel Segal. Updates the php readme file to remind people to change config/container.js with their social api url prefix value. 




git-svn-id: 3f2e04d30bd9db331bbfc569b45e7de8c0d84ef0@677703 a5cc9254-8de9-e8be-c026-97bcafcbeca4

nevali/shindig,nevali/shindig,nevali/shindig,nevali/shindig