Add FreeAuth Support

[GoogleCodeExporter]

As per the comment [1] on the Marketplace Review, a user would like support for 
FreeAuth. In [2] there's a link to the archive.org cache of the freeauth OTP 
generation psudocode, and in [3] is a concrete implementation of the OTP code 
for PHP.

[1] 
https://play.google.com/store/apps/details?id=org.cry.otp&reviewId=1337895351433
1718147
[2] 
http://web.archive.org/web/20100306020705/http://freeauth.org/wiki/index.php?tit
le=FreeAuth_Protocol_Implementation
[3] 
http://web.archive.org/web/20100306020757/http://freeauth.org/wiki/index.php?tit
le=One_Time_Passwords_with_PHP

Original issue reported on code.google.com by [email protected] on 2 Apr 2012 at 1:42