Minor update to 2.20. Changed so that template files may end with either .html OR .htm and made the check case insensitive so template files can be named with uppercase, lowercase or mixed case and still be retrieved later. Reversed order of step by step instructions for modifying newsletters.php manually so that they will be easier to follow since modifying from top down changes the line numbers you are looking for later on. I also updated the step by step instructions with one step that was missing and was originally only included in the modified newsletters.php file that comes with the contribution. Added sample template to templates folder.

Corrected earlier download as I missed a closing parenthesis in one statement that causes the file to not work. Full package attached.

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