adding CSS unicode characters

@jacine, I added the CSS version of the Unicode characters to the _symbolset.scss file. I didn't remove the characters, just added a second content declaration, which should override it. Seems to have fixed the problem for me. If at some point anyone else runs into this issue I thought this might be valuable for you to have.

Apparently all you have to do to get the Unicode characters to work in CSS is remove the &#x and replace with a backslash.