Replacement Tabs

Technically this isn't a full remix, just the addition of a part for http://www.thingiverse.com/thing:1384316

This case is awesome, except for the tabs which do break off very easily. I knocked together this addition as a quick fix that saves having to reprint the entire back cover if the tabs break off. Just slide these rails onto the sides of the back cover where the tabs were, and you should be good to go. While this will introduce a slight gab that wasn't there previously, it's better