Merge pull request #1 from hobeone/master

Add support for arbitrary headers (like Date).
Fixed bug that would crash if Attachment.Data was left nil.
add config for StartTLS to allow it to start without error
allow the Body to be in viewable qprintable encoding, and leave the html in base64
Merge pull request #2 from glycerine/master

tls doesn't block sending; plaintext viewable without base64 decode
Added Baby Gopher badge.
turned HTMLBody into a bytes.Buffer to use it as a Writer for html/template
store all addresses as actual mail.Address instead of plain strings

moved parsing to when addresses are set on the message rather than during
message content creation.
variable name for golint
dropped implicit else statements
Revert "turned HTMLBody into a bytes.Buffer to use it as a Writer for html/template"

This reverts commit 4a15e52f78fea998683006a724e4eee848a6b501.
Merge branch 'mail-addresses' of https://github.com/dagoof/gophermail into dagoof-mail-addresses
Merge branch 'dev'
Updated README to instruct users to use the gopkg.in import path
Updated README with new gopkg.in link.
Update README.md
Update README.md