Cleanup and other minor updates.

_variables.scss - Converted default colors to Sass colors and removed baseline grid overlay.
oldie.scss / style.scss - Added classes partial.
_base.scss - Alphabatized reset, removed baseline grid overlay, and other small changes.
_print.scss - Updated print stylesheet per HTML5 Boilerplate.
_config.yml / feed.xml - Updated paginate limit and added feed post limit variable.

Added: _classes.scss and example-draft-post.html