Set of grids now without 'set-' prefix but 's' suffix, and now select immediate universal descendant instead of .grid
Update README.md
Pull/push to false by default when using . selector
Breaking change: no more IE7 compatibility by default.
README changes
Merge branch 'beta' of github.com:pierreburel/grid into beta
IE7 compatibility in mobile-first example
New default values: .grid for -wrapper-name and .grid-unit for -unit-name
no-gutters & reset-gutters correction
Introducing -prefix option and direct descendant selector (when -unit-name: false)
Merge branch 'beta' of github.com:pierreburel/grid into beta

* 'beta' of github.com:pierreburel/grid:
  Introducing -prefix option and direct descendant selector (when -unit-name: false)
  no-gutters & reset-gutters correction
  New default values: .grid for -wrapper-name and .grid-unit for -unit-name
  IE7 compatibility in mobile-first example
  README changes
  Breaking change: no more IE7 compatibility by default.
  Pull/push to false by default when using . selector
  Update README.md
  Set of grids now without 'set-' prefix but 's' suffix, and now select immediate universal descendant instead of .grid

Conflicts:
	README.md
Default responsive gutters correction