[11873][PATCH] Add gossip_script for gossip_option banker and vendor

[klark20]

* What bug does the patch fix? What features does the patch add?

NPC Argent Squire and Argent Gruntling requires gossip_script for Vendor and Bank to cast a spell, if you click the gossip.

* For which repository revision was the patch created?

master

* Is there a thread in the bug report section or at lighthouse? If yes, please add a link to the thread.

no

* Who has been writing this patch? Please include either forum user names or email addresses.

me

http://paste2.org/p/1547797

[lillecarl]

Seems like its not 100% safe but thnx for contributing;)

[Schmoozerd]

in [11873]. Thank you

@lillecarl - thanks for the comment, but next time be more specific