Added the ability to set the honoree's name in the reply email field.

Allen,

So first off thanks for providing a plugin that's open source and so easy to integrate with WP sites.  My wife works for a non-profit and they are ecstatic about this plugin!  It's been working great, but there are some features she would like to see added, and after getting ridiculous price quotes from web developers, I told her I'd work on it.  I am a professional software developer, but it's all been embedded and real-time code, so I'm starting to dabbling in web development, so feedback and corrections on the pull requests are gladly accepted!

Anywho, the pull request adds the ability to load the honoree's name as a placeholder in the tribute response email.  Makes it a bit more personalized. 

Josh