Restyle the secondary nav
Add initial slider component
Implement asset loader into slider by default, give slider controls default positioning
Move the secondary nav back to the right place
Add section for alerts
Fix up /legacy page
Fix the secondary nav on card layer pages
Remove superflous media gallery rules
Revert "Fix up /legacy page"

This reverts commit 64d16d6dd3806ba2f74f41dbca7ea30fc90ef0d0.
Fix up some legacy oddness.
Merge pull request #729 from lonelyplanet/matth/slider-component

Slider component
Quickfix media gallery aside position
Quickfix: slider spec config
Merge pull request #731 from lonelyplanet/remy-subnav

Restyle the secondary nav.
Hotfix for making current item in new subnav bold
Add base class to the layouts
Merge pull request #732 from lonelyplanet/if-base

Add base class to the layouts
Move Style Guide from helper methods to classes