Zend_Log_Writer_Mail traction

Since I posted my Zend_Log_Writer_Mail proposal and asked for feedback on fw-core, it's gotten a bit of traction in the comments.

Perhaps it will be officially reviewed and placed into the incubator before php|tek 2008 in May because it's part of my "Robust Batch Processing with PHP" talk.

Special thanks to Thomas Fritz, Lars Strojny, Tomas Markauskas, Apaella, and Vincent de Lau for the feedback and "+1"s thus far.