Tabs to spaces in templates

We mostly seem to use 4 spaces for indentation, but I kept running into tabs, which can clutter commit messages when those lines are touched.

This will impact the audit trail for quite a few files though, so I'm leaving it open for debate. 

Conversion found on [SO](http://stackoverflow.com/questions/11094383/how-can-i-convert-tabs-to-spaces-in-every-file-of-a-directory)

    find . ! -type d ! -name _tmp_ -exec sh -c 'expand -t 4 {} > _tmp_ && mv _tmp_ {}' \;