Created shared/layout_helpers with several mixins

this fille will be used to house layout specific
helper mixins.
Added test for proper layout base

div.floating-grid
Removed panel styling from main container
Modified home to use new layout standards
Added Eclipse .settings folder to .gitignore
Provided helpers and tweeked home page layout
Create content-panel class and implemented mixin
Merge branch 'Feature-US26-content-panels' into develop