add defaults for swiftmailer
use <ul> for formatting params
correct error of converting NULL to string
use formatting option in dumper
Merge pull request #1748 from craigh/swiftmailerImprovements

Swiftmailer improvements refs #1676
Correcting error - ContextErrorException: Notice: Undefined variable: kernel.
Merge pull request #1750 from shefik/1.4

Correcting error - ContextErrorException: Notice: Undefined variable: kernel
toname fix if not set for mailer API.
add memory usage note to install docs. closes #1583
document js script naming standard. closes #1044
add logging option to Mailer. closes #726
Merge pull request #1756 from craigh/MailLogger

add logging option to Mailer. closes #726