Losslessly compress all images

Image is unchanged, but now loads way faster. I think I shaved about
80% off of the image size on average with https://imageoptim.com/ (can
also be integrated into grunt)
Update Gruntfile.js with better functionality

A few more grunt tasks were added:
- grunt-browser-sync (serve files on localhost so changes can be
immediately seen)
- grunt-imageoptim (lossless image compression)
- grunt-newer (only process files if they have been changed)

Run `grunt build` to compile everything
    `grunt serve` to open file in browser.
Merge pull request #2 from EdenSG/master

Losslessly compress all images
tracking stats for leaderboards
Merge branch 'master' of github.com:fightforthefuture/battleforthenet-widget
Compressed images

Looks like I missed a couple
Nicer box shadow for `.loading-region zoomedOut
preload images, fix line-height in form
close button no longer displays on embedded version
fix image preloading
Convert indentation to tabs

It was spaces. Does this make a difference?
Remove unnecessary js preloading
Remove unneeded comma, replace special character

Right single quotation mark displays incorrectly in FF.
Fixed by replacing with &#8217;
Gruntfile changes

`grunt`(default): compile anything that isn’t already compiled

`grunt build`: compile everything, no matter what has already been
compiled
`grunt watching`: compile anything that isn’t already compiled as
changes are made
`grunt serve`: run watch task and open in browser
`grunt host`: open in browser, but don’t compile anything.
new readme tweaks
examples for custom URL
Update README.md

Small tweak to make custom URLs more obvious.
Update README.md
new style banners with new spinner
Merge branch 'master' into gh-pages