UTF & Pingback : Final 2 previously draft classes

Added explanations + examples
UTF & Pingback : Final 2 previously draft classes

Added explanations + examples
[UPDATE]: SMTP: Support log disabling

https://github.com/bcosca/fatfree/commit/d944cf622c21a5b240c55e5977d10d1ab6c31946
Merge pull request #37 from emanwebdev/master

UTF & Pingback done + update for SMTP