Show/Hide at Sizes, More on Gutters

Ascribing .size-lt-large-only, for example, only shows at sizes smaller
than large.
Added .lightest-text
Prepping for inclusion

Not there yet, but getting ready to enable easy inclusion of Sans
Condensed
More prebuilt sizing
Back to absolute positioning on cracked, unshelved Spine.
Getting directories sorted
Add repository, per Felt's request
Extra period
Merge pull request #24 from jeremyBass/master

Improments and new features