encode non-ascii characters

I was seeing this error when running in production

    ActionView::Template::Error (Invalid US-ASCII character "\xF0"

from this line in my stylesheet:

    @import 'entypo'

Note that I had no issues running this in development, it was only after deploying to a production environment.

Strategy
------------
Found none ascii characters with: `pcregrep --recursive --color='auto' -n "[\x80-\xFF]" app/assets/stylesheets`

Replaced non-ascii characters with the annotated ascii escape sequence at the end of the line. Is it safe to assume those are correct?

Disclaimer, I double checked my work, but I _did_ do this by hand.