Incorrectly adds prefix to font file extensions.

[jgornick]

It seems the prefixer is adding the prefix to the font file name extensions:

@font-face {
  font-family: 'Glyphicons Halflings';
  src: url('../fonts/glyphicons-halflings-regular.eot');
  src: url('../fonts/glyphicons-halflings-regular.tb-eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.tb-woff') format('woff'), url('../fonts/glyphicons-halflings-regular.tb-ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg');
}

Notice the .tb-* in the filenames on the second src property.

[brettalton]

I can confirm this is still occurring.