Changes for grid layout and relevant styling

+ GridPageLayout.aspx
- Changed grid__item to new class "grid__item--compact"
- Removed comment css hack to remove space inbetween
grid items.
+ presentation.html
- Removed "<div style=clear:both;>", it was causing the
page to go blank when trying to edit something.
+ width.scss
- Added the original "s4-titlerow" class back to the css, this
takes care of the page title overlapping issue
+ grids_custom.scss
- Contains overwrite for the "grid__item" class called
"grid__item--compact". This class deals with the extra space
causing wrapping.