add signatures for wordpress up to version 3.8


Hi there! 

How's it going?

Added fingerprints for wordpress, below are the results of some tests:

http://opportunity/wordpress-3.5.1.tar.gz_extracted/wordpress/ [500] WordPress[3.5.1,3.5.2] 
http://opportunity/wordpress-3.5.2.tar.gz_extracted/wordpress/ [500] WordPress[3.5.1,3.5.2] 
http://opportunity/wordpress-3.5.tar.gz_extracted/wordpress/ [200] WordPress[3.5]           
http://opportunity/wordpress-3.6.1.tar.gz_extracted/wordpress/ [500] WordPress[3.6,3.6.1]   
http://opportunity/wordpress-3.6.tar.gz_extracted/wordpress/ [500] WordPress[3.6,3.6.1]     
http://opportunity/wordpress-3.7.1.tar.gz_extracted/wordpress/ [500] WordPress[3.7,3.7.1]   
http://opportunity/wordpress-3.7.tar.gz_extracted/wordpress/ [500] WordPress[3.7,3.7.1]     
http://opportunity/wordpress-3.8.1.tar.gz_extracted/wordpress/ [500] WordPress[3.8]         
http://opportunity/wordpress-3.8.tar.gz_extracted/wordpress/ [500] WordPress[3.8.1]