[Session Configuration] add clarifying notes on session save handler proxies#3423

Merged

weaverryan merged 2 commits intosymfony:2.3from

cordoval:2889-explain-what-a-session-save-handler-proxy-is

Jan 9, 2014

Commits on Jan 4, 2014

answer some questions and clarify the best chapter imo from the symfony documentation
cordoval
committed

Commits on Jan 5, 2014

address comments from @WouterJ
cordoval
committed