proof of concept

created LGChangeHandler, which will act as a delegate to multiple
NSTextFields.  It will receive textDidEndEditing notifications from
NSTextFields and update defaults.

I’m marking sections of saveAndClose: as Implemented as I move the
saving functionality into LGChangeHandler

Testing of just the smtpServer field was successful; this can be
expanded to the remaining text controls
Implemented removal of Save and Close button

Fixes #41, fixes #35, fixes #19

Also fixes #44 by adding a new text box to alter From: box.
Merge branch 'master' into merge-remove-save-and-close

Conflicts:
	AutoPkgr/LGConfigurationWindowController.xib
Merge branch 'merge-remove-save-and-close' into remove-save-and-close
Cleaned up a few places and fixed text field spacing on the 'Configure Schedule' tab.
Merge pull request #64 from lindegroup/remove-save-and-close

Remove save and close