css updates

unmagnified, removed around 8kb from the compiled mix.css

new file: normalize-edit (removes all the unused selectors from normalize.css) -- still playing it safe w/some of the selectors though. could probably be pruned further.

main.css/index.html - new .btn & .btn-cntrl classes to offload repetitive CSS into single reusable classes.

fixed a few typos & pruned out a few lines of css that were being overridden later in the cascade. added a few vendor prefixes where appropriate (unless it broke things, like w/the needle)

updated concat.js to reference new normalize-edit.css instead of regular normalize file.

kept normalize.css just in case you wanted to have it around for something else?