[Differences]
+ Added the string template handler.

[Reasons]
+ To work string template handler.
[Differences]
+ Added the .md template handler.

[Reasons]
+ To work .md template handler using rdiscount gem.
[Differences]
+ Added the .merb template handler.

[Reasons]
+ To work .merb template handler using rdiscount gem.
[Differences]
+ Changed the handler to be able to render multi-format mail.

[Reasons]
+ To be able to render multi-format mail.