o-ft-forms now uses o-ft-typography for Label and Additional Info styles.
Still directly dependent on o-fonts, as prefix, input text and error text styles are not yet in o-ft-typography.
Now calls oFtTypographyIncludeFont(label) instead of calling o-fonts mixin directly.
Renamed global-errors mustache template to match output demo name.
Split global and section errors into separate demos. Corrected HTML structure of global error.
Merge pull request #11 from Financial-Times/labels-from-typography-module

o-ft-forms now uses o-ft-typography for Label and Additional Info styles. Section and Global styles are separated