[issues-13] Fixes how column padding is applied

The new way is much more robust and less complex. This allows
padding to correct be applied to any number of columns and not just
5 or less.
[issues-13] Updates example css
Merge pull request #14 from leadiv/issues-13

[issues-13] Fixes how column padding is applied
Adds extra padding to take into account fluid "negative space"

The fluid column blocks now use negative margins and padding to
create a negative space so that adjacent blocks can fill that area.
Simplifes calculations for placing column blocks

The overall container padding was removed and now applieds to all
fluid column blocks. This allows for less logic and css since
fixed width column blocks can be ignored.
Updates code documentation to reflect change in approach
Merge branch 'UPDATE-COLUMN-APPROACH' into issues-15

Conflicts:
	dist/_column-policy-private.scss
	dist/_column-policy.scss
	examples/grid/column-policy/stylesheets/column-policy.css
Merge pull request #24 from leadiv/issues-15

Issues 15 Removes padding from the parent container