Bug 18810: Update Font Awesome to 4.7.0

Bug 18810: Update Font Awesome to 4.7.0

Test plan:

0) Apply the patch
1) Edit a template and use any of the new icons, see
http://fontawesome.io/icons/
2) Verify that the added icon is shown

For alternative test see comment #2. Works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>