Added Responsive Grid Attribute
Cleaned up and changed default value
Fit guidelines
Added variable
feat($ionicScrollDelegate): allow anchorScroll to animate with param

Addresses #508
chore(package): remove extra versions
chore(build): use node-sass instead of ruby sass
chore(build): optimize `grunt watch`
fix(browser): on first hash-set, dont set scrollTop
update contributing text
Merge pull request #567 from mhartington/Responsive-Grid

Responsive grid
chore(build): escape slash in site-publish script

Closes #574
chore(travis): remove reset from site script
feat(grid): Added classes, variables and mixins for responsive grid options
fix(list): css: don't make last .list on page have margin-bottom

Addresses #425
test(ionicContent): mock scrollView.{scrollTo,getValues}
fix(header): Header icon button css fix for Safari, closes #576
feat($ionicScrollDelegate): add scrollTo(left,top,animate) to delegate

Also moves $ionicScrollDelegate.register to $ionicScroll controller,
and makes `<scroll>` directive be registered with $ionicScrollDelegate.
fix(scroll): `<scroll>` is now registered with $ionicScrollDelegate

This is just a whitespace change with a commit attached to it so that we
can have the fix appear in the changelog.

The actual changes are in c119498d1bdfe9c5ec0d7453fce8f9a18227977c.
fix(refresher): make refresher css not create gap at end of list