1.3

Have refactored the code to make it easier to maintain - separated the sub-pixel fix grid from the original grid and also separated global mixins to reduce duplication. 

I have also added a mixin that allows for the creation of equal height columns and a mixin to make an element such as body the container of a grid.

Update: I have removed my grid solution (see commit 989a2b) based on a column-gutter-column type grid. I already have noticed several issues with this grid (due to the use of nselectors), and have developed a separate grid system to fix these issues however it is no longer backwards compatible with sematic.gs, however I will post a link here when I create a repo so that you can see what i have done and whether it would be possible to merge it into semantic.gs.

Update2: Have created a grid system [here](https://github.com/laughingwithu/flawless-semantics-grid) as mentioned above.