Reduce README
Merge branch 'more-ui-improvements' into gh-pages
Change random color luminosity to dark

It's less fun, but more readable.
Add check for integer in lengthInput

The message up top changes to '...must be an integer' if the value
inputted is either 1. not a number or 2. not an integer (i.e. doesn't
round evenly).

TODO: see if there is a better way to handle the "not an integer"
notification, including popup, tooltip, or maybe even just bringing
more focus to the changed text.
Change file indicator hover-over to random color

...by adding it to the list of styles modified by randomColorStyle.
This requires a special case where I convert the hex value to rgb and
attach an alpha of 0.5, since my current randomColorStyle setup doesn't
allow different cases (But who knows!)