Updated media-query mixin
- Added breakpoint variable, to let one choose his own mq names & breakpoints
- Media query mixin reads out those breakpoints
separated griddle build into width & push build mixins
used proper if statements in widths
remove pullers
Grid extension
- incorporated grid floating into one selector
- added markup fix variable
- added center grid modifyer
- added vertical grid modifyers
- added gutter modifyers
Merge branch 'feature/grid' into develop
added new mq style to visuallyhidden selector
updated media query comment
Updated to version v3.1.0
- Updated changelog
- Updated version numbers
- Added bower.json
Merge branch 'release/v3.1.0' into develop