fixed typo in gemfile doc
Merge pull request #425 from thedamfr/patch-1

fixed typo in gemfile doc
added documentation, how to use variables

couldn't understand how to modify the bootstrap variables. Added an example where we redefined a variable value. And define a variable in terms of another variable.
upgrading to v3 w/ light customizations
merge upstream/master
ms breakpoint WIP
add mid-small(ms) breakpoint
update media-query/breakpoint variables
Merge pull request #432 from morenoh149/patch-1

added documentation, how to use variables
Merge remote-tracking branch 'upstream/3' into 3.0.0-wellnessfx
add float:left for full width grids (col-xx-12) as it forces wrapping when necessary
resolve merge conflicts w/upstream/master
resolve merge conflicts
remove deprecated (and interfering) hide-text mixin
merge conflicts - breakpoint