Avoid using attribute selectors and :not instead of class selectors

It's easier to read and provides better support to those whom have
implemented the old grid with many extra/other classes.
Don't change the width of nested grid12.
Further scope the first class in BP3.
Consistency in function names
Cleaner, subtle tab interface. Close #486.
Begin image testing.
Add styles for interactive image and caption.
Use a more descriptive class name.
Add documentation for file usage.
Add structure and consistency to color variables.

Update to new color palette.
New line for diffs
Use new color variable name.
Image style
Image test with various image types and presentations.
Merge pull request #518 from kabel/grid-selectors

Avoid using attribute selectors and :not instead of class selectors
Merge branch '4.0' of github.com:unl/wdntemplates into image
Scale images correctly.
Load the placeholder plugin as a module from requirejs
Use WDN's jQuery in placeholder plugin.
Restore audio, video, svg tests to Modernizr