Merge branch 'rs-woff-fonts' into 'master'

Use WOFF versions of SourceSansPro

See https://gitlab.com/gitlab-org/gitlab-ce/issues/6023

See merge request !2357

app/assets/fonts/OFL.txt

-Copyright 2010, 2012 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
+Copyright 2010, 2012, 2014 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
+
 This Font Software is licensed under the SIL Open Font License, Version 1.1.
-This license is copied below, and is also available with a FAQ at:
-http://scripts.sil.org/OFL
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
 -----------------------------------------------------------