Grids icon SCSS: Set background to none for external links in page headers/footers.
- Prevents external icons from appearing in IE7's page headers/footers.
Build: Add Travis IRC notifications
Slide out tab SCSS: Restored "raw" content when printing.
Merge pull request #2898 from nschonni/travis-irc-notifications

Build: Add Travis IRC notifications
Merge pull request #2899 from EricDunsworth/v3.0-slideout-print-raw

Slide out tab SCSS: Restored "raw" content when printing.
Merge pull request #2891 from EricDunsworth/v3.0-grids-external-ie7

Grids icon SCSS: Set background to none for external links in page headers/footers
Resolved merge conflicts.