New Grid System: generator of columns and container

- Calculate to container width (desktop, tablets and mobiles).
- Calculate each column width (fixed by desktop) and (percentages by tablets and mobiles)
- disabled the Grid system (helper classes) to avoid compatiblity problems with new system.
- Testing new grid system.
remove home.scss
Adding generator to column gutter. Also, was improved the return of grid functions.
Renamed the mixins of internal grid.
Moving to separate files the testing of different grid systems.

- index.html with internal grid system by default.
- other grid system in grid-helper-classes.html.
Grid systems are now more flexible, modulars.

- Moving to modules directory.
- Enable/Disable each grid system is very easy, in the modules/base.scss
- By default internal grid system is enabled and grid system helper classes is disabled.
adding support to IE8
Improving support to IE8

- Added modernizr library.
- Improve mixins for IE8
adding generator of padding row to internal grid system.
Merge branch 'new-grid'
fixed issue with font size for h1