added first implementation of an asynchronous transport
-
fixed spool transport
Merge branch 'master' of github.com:swiftmailer/swiftmailer into ticket-65

* 'master' of github.com:swiftmailer/swiftmailer:
  removed constants (they were not used except in the bootstrapping scripts)
  simplified autoloading
  added __toString() methods where a toString() method already exists
  added a setAuthMode() to AuthHandler (refs #54)
  removed phpdocumentor from source
  made speed optimization on previous commit
  changed all file headers to point to the LGPL license, added Chris copyright
  made some changes to make the license more easy to understand
  fixed 'Call-time pass-by-reference' warning in ArrayByteStream (refs #78)
  optimizations on new API
  Small optimization
  Bug Fixes in the new API of characterReader
  So, added methods for the characters readers in order to limit number of calls (may be adapted)
  Performances improvement on ArrayCharacterStreams which is used by QP encoder
added a BlackholePlugin that ignores emails
added a NullTransport
added a RedirectingPlugin that redirects all emails to a single recipient
fixed typo
added some phpdoc
updated version to 4.1.0
fixed typo
fixed PHPDoc for Spool classes
added the possibility to configure the spool
fixed previous commit
updated CHANGES for 4.1
merged master branch into 4.1
Merge branch 'master' into 4.1

* master:
  worked on chapter 1 of the doc
  added book content in the markdown format
removed obsolete comments
refactored the headers to create a new configurable Swift_Mime_Grammar class
Merge branch 'master' into 4.1

* master:
  fixed Exception class in Swift_Mime_SimpleMimeEntity::_assertValidBoundary() to be coherent with the PHPDoc