add webfont resource files for Libertine font family
add config option and styles for Libertine font family
avoid over-riding font family preference if the font has good glyph support
reduce font size boost for Hebrew from 1.5em to 1.2em

The 150% size increase is excessive and makes usage impractical with
several columns open. 1.2 is a more usable default value and works out
so that Hebrew versions take up about the same about of vertical space
as other languages for the same verse range.
Allowing toggles to have a default value, so justification can be off by default
Merge branch 'typography-libertine' of https://github.com/alerque/browserbible-3 into alerque-typography-libertine

Conflicts:
	app/css/bible.css
Merge branch 'alerque-typography-libertine'