Merge pull request #2 from greenpeace/feature/responsive-header

Feature/responsive header
Merge pull request #3 from greenpeace/master

merge master back in develop
change button class to make compatible with drupal
remove grunt and guard
solve button problem in FF
update block element
btn class changed by button class in php pages
GREEN-1654 button lowercase, padding, font-size and border-radius
GREEN-1655 font size and family in article headings with the style from p3
GREEN-1656 footer for desktop php/sass
GREEN-1656 footer for desktop php/sass
GREEN-1654 buttons: border radius in px and more lateral padding
GREEN-1654 buttons with icons and with text and icons examples in styleguide
GREEN-1658 country selector
GREEN-1656 full footer only desktop
GREEN-1656 footer hidden when no desktop
GREEN-1655 new bullet article-list
GREEN-1655 article headings color #003300
l-branding class now is l-branding-header
GREEN-1685 nav-btn size is minimum 44x44px