Update readme.md

added "web-apps", reworded a bit about tutorials, and added style guides that match what we've already been doing
added an image of using roots

standard ubuntu terminal w/ powerline installed. font is Inconsolata and the background is transparent with a translucent drop-shadow added via GIMP
wrapped img w/ an <a> to prevent GH from making it a link
mention JSDoc

sort of closes #96... or at least moves it to the readme
add roots logo, center badges, reword the intro paragraph a bit, add note about underscores
moved the terminal image into usage

it was too close to the other images... too much centering in one place
moved man page link out of that list and into the sentence preceding it
Merge pull request #183 from jenius/readme

Readme updates