Shields now possess block value. Wielding a shield grants the Block talent...

Shields now possess block value. Wielding a shield grants the Block talent that will block the next attack and allows for a counterstrike.
Riposte talent doesnt provide a free attack, instead it boosts counterstikes


git-svn-id: http://svn.net-core.org/repos/t-engine4@5101 51575b47-30f0-44d4-a5cc-537603b46e54