get rid of println
fix SLF4J failed to load classes
Fixed undesirable dependencies
Added test
Fix bug. ScalateSkinnyMailerSupport can't find XXX.html.XXX
Commented
Modified to get type safety
Renamed file
Fixed bug.
Fixed bugs.
Modified. smtp connection will be closed after sending a email
Modified default template directories
Added method which sending some emails on one connection
Fixed bug