made fonts easily exchangable
randomize fieldnames, add honeypot

the input names for the captcha are now changing depending on the
current page and useragent.

a CSS hidden field was added that should *not* be filled.
don't let wave generator create anything unless audio is enabled
added new 'math' mode
translate Math problem Chinese strings
Merge pull request #9 from haobug/master

Simplified Chinese translation from math problem feature added