Allow a user to pass an IO object when adding a font
Use public HTTPS clone URL for temporary ttfunk dep
Rename 'name' variable to 'src'
Allow us to add a Prawn::Font directly
Lock to rspec version 2.14.1
Default `#read`able objects to the 'ttf' format
Use released version of ttfunk
Merge branch 'master' of github.com:prawnpdf/prawn into io-fonts