Merge pull request #7 from iamjessklein/gh-pages

let's make this intro more human friendly.
the blockly iframe is only created when it needs to be shown.
Add a linkify button to the tutorial simulator.

This enables quick sharing of tutorial simulator state.

Note that because the current HTML is also shared, this enables
reflected XSS on the origin of the tutorial simulator!
base64 encode qs args to bypass reflected XSS filters.
abbreviate temp. block, add dynamic tooltip.
dynamic tooltip for weather block.
show outfit thumbnail on return block.
added a tiny debugger to blockly page.
handle unicode data when sharing links.
add lz-string.js.
use lz-string to compress tutorial simulator state in URLs.
added explanation of conditional logic.
visual programming editor area has min-width: 640px.git diff
show only horizontal scrollbar on windows.
make the first tutorial pg links look like green buttons.
turn all tutorial next-page links into buttons.
add app screenshot
remove learning objectives, just link to challenges section.
move tutorial/app.png to tutorial/img/.
added tutorial/img/tip.png.