add: lib/headers/subject.js
change: adding header handlers. Now they are a new instances
  instead of static.
add: subject header handler.
add: generic handler for unknown headers
move: unknown header handling code from email-obj.js to generic-headers.js
add: registerHeader()
mod: intergrated header handlers and preset generic ones
  (i.e. subject, from, to).
fin: header parser mostly complete.
add: msg-part.js to handle multipart messages
mod: some areas that needed tweaking
fix: header value's containing tabs and other characters.
add: some static values for emailobj.
clean: Pointless comments and commented out code
move: some code around to make more sense
add: test creation of message.
fix: emailobj and msgpart getHeader()
clean: moved header and header value regex to variables.