Besside-ng: Merge a slightly modified version of the pull request #3 (GitHub) to add regular expression matching for the SSID

git-svn-id: http://svn.aircrack-ng.org/trunk@2397 28c6078b-6c39-48e3-add9-af49d547ecab
Moved constant (IE max size) to a common file of Airodump-ng and Besside-ng.

git-svn-id: http://svn.aircrack-ng.org/trunk@2398 28c6078b-6c39-48e3-add9-af49d547ecab