Merge pull request #97 from jeremyBass/master

Clears the overview lost event issue
Header signature position
Cropped spine test file
Fix no bleed spine
Fixing unbound
Add visibility to glue:befor
Break out marginalize rules
Separate and simplify gutter rules
Normalizing naming
Correct .gutter.wide position
Correct spacing class position
Restore column number based gutters

First of type and last of type can only count when columns are child
elements of the same parent. Unfortunately, too limiting.
Make default row constraint overridable
Eliminate binding on nested rows
Reset hybrid to pixels at large

I’ll need to switch hybrid at medium. Boundless, unbound needs fixed
widths instead of percents.
Move destination of test files
Moving help into Wiki
Make content area discernible
Remove long content from cropped
Demonstration table for Wiki