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 'release-1.0.0-alpha' into develop
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
[issues-16] Adds support for calc
[issues-16] Updates examples to include an example with calc and without calc
Merge pull request #25 from leadiv/issues-16

Issues 16 Add support for calc
[issues-17] Adds support for nth-child offseting to columns layout

This allows for much more complex grid layouts to be achived. By
allowing multiple type of grids to live in the same columns
container.
Merge branch 'develop' of github.com:leadiv/column-policy into issues-17
[issues-17] Adds an example for the offset option for the column policy mixin
[issues-17] Adds sass-cache folder to be ignored.
Merge pull request #27 from leadiv/issues-17

Issues 17 Add offset option to column-policy
[issues-21] Replaces hardcoded class/data attribute names with variables

Allows the implementor to define the class names or data attribute names
to use when generating the stylesheet.
[issues-21] Updates examples to show how to redefine the classname.
[issues-21] Updates attribute example with the custom attribute
[issues-26] Adds a condition to generate overflow only if calc is not supported

When using calc overflow is not nessessary since there is no over
flow with margins and padding.
Merge pull request #28 from leadiv/issues-21

Issues 21 Allow custom naming of the column class
Merge pull request #29 from leadiv/issues-26

[issues-26] Adds condition to generate overflow if calc is not supported