Added missing trailing slash and 'f' in Makefile.am.

Commit 2026b0dd2a337e3873283ba501d7a5eb75aa9cfa updated the Makefile
but missed a trailing slash to append the file list.

The .woff font file was also missing an extra 'f', which prevented
make from finding it

Review: http://reviews.apache.org/r/16828