Adding glyphs to Arabic fonts

Hi Dave et al
I've added a page on the above as you suggested, and also included an (optional) appendix on installing FF on Ubuntu 14.04.  I also added a note to README to say you need ruby-dev installed before gem install jekyll will work. 
Kevin
My understanding is that you cannot modify a font that does not allow it even if you don't redistribute it &ndash; not redistributing it is just a way to hide from others but it does not make your edits legal.