Use %placeholder for streching examples.
Added support for WOFF2 file types in the font-files helper function.

Change-Id: I76d2004eeace97b96826ab6d9d6df9242ba78d7e
OMG
Fix broken link.
Fix references to the old doc-src directory in the docs.
Replace cornell with linkedin on the homepage.
Merge pull request #1632 from barraponto/stretching-placeholder

Using extend-only selectors for stretching examples
Merge commit '25c631f' into stable
Show how to install the lastest prerelease.
Fix obsolete reference to VERSION.yml
Merge pull request #1742 from williamboman/master

WOFF2 support for font-files
Merge remote-tracking branch 'origin/master' into stable
Add missing image.
Update CHANGELOG
Grammar update.
Fix example
Document new project layout.
Blueprint is not an install option anymore.
homonyms.
Fixed issue #1766. Handles gradients without calling the compass mixins.