improve outlines, selects, helper classes

- respect accessibility and display better outlines
- add helper classes for screeenreaders
- better monospaced text
- better text-breaking

TODO:
- cross-browser outline test
- better grid-system gutters
clean up content
clean up
Revert "clean up"

This reverts commit 8507c7bd4e3392c40368c2378f3dfd3439d592d6.
fix typo
improve :focus state on form elements
increase form responsiveness
align height between inputs and buttons
split core into flexible modules, minor bug fixes
I want a backup of this
add cross-browser styles to <legend>, minor bug fixes
add more radio and checkbox examples
minor bug fixes
cross-browser buttons line-height
massive grid system update, headings small update, minor bug fixes

grid system: is there a fix for Safari and Opera?
now the grid system is 100% fluid in IE7
add author's custom styles empty section
add no-ie7 files