Add dimensions readme
Add layout readme
Remove slashes
Add spacing readme
Add text util readme
Add text util visual test
Add readme to Visiblity stencil
Dimensions Utility: readme - clarify description
Make it easier to parse the different class names
Add list of dimensions options
Typo and clarifying the layout utilities
Single quotes to double quotes
Apply doc fixes

* Pluralize utility headings
* Replace inline styles with html block comment
* Expand visibility description
Fix typo
Merge pull request #96 from mobify/utils-readmes

Add Readme Docs to Utils