make params act a bit more like Mandrill docs
Merge pull request #8 from danieljonce/master

make params act a bit more like Mandrill docs
Added meteor packages to package.js; closes timmyg/meteor-mandrill#1
Optional asynch sendTemplate by supplying callback; closes timmyg/meteor-mandrill#9
Add renderTemplate function; Dropoply/webapp#187
Update docs; closes timmyg/meteor-mandrill#13
Merge branches 'asynch', 'render', 'docs' and 'package'