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Variable names for grid and col classnames

1. .grid and .col classnames are now variables and can be changed in gridlex-vars.less/.scss
2. push-left and push-right are now data-push-left and data-push-right (using data-attributes and not custom-attributes which break reactJS...)
3. Fix error in sass version in makeCol();

• Add noBottom
• Add gl-col-bottom
• Fix $gl-gutter default
• Fix variables default for scss
• Docs

Update 2.0.9 with https://github.com/devlint/gridlex/pull/12

v2.0.7 with IE11 fixes

Sass version now co-exist with Less version.

Protect class-attribute selectors ( issue #1 )