Now uses o-ft-typography for heading and body styles.
Now has silent mode for SASS.
Added npm cache clean to Travis build.
Implementing feedback from Design:
Re-ordered heading styles to allow article-subheading1 style to be introduced as h3.
Introduced bodylead style.
Updated demo with examples.
Merge pull request #10 from Financial-Times/use-typography-module

Now uses o-ft-typography for heading and body styles.