enhanced some contents of secure coding guideline#5

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co3k wants to merge 10 commits intoopenpne:masterfrom

Commits on Oct 19, 2010

added description for directory traversal attack by using storing view caches
Kousuke Ebihara
committed

Commits on Oct 27, 2010

added description for session management (WIP)
Kousuke Ebihara
committed

Commits on Oct 28, 2010

added description about session hyjacking and session fixation
Kousuke Ebihara
committed
fixed missing indentation
Kousuke Ebihara
committed

Commits on Jul 27, 2011

Commits on Aug 24, 2011