first pass at getting atom feed working.

Related to issue #34
Changes to atom feed in response to comments from Mr0grog

issue #34

Conflicts:
	app.py
updated example configuration file to add ATOM_SIZE

issue #34
made minor tweaks

doing this with the github webeditor, we will see how this goes.
tweaked default ATOM_SIZE
Merge branch 'atom_rb' of github.com:tacaswell/srtracker into tacaswell-atom_rb
Move Werkzeug imports up above user-code imports.