Correct git clone code in help file

Previous code was for users who had public keys set.
Merge pull request #184 from 1beb/patch-2

Correct git clone code in help file
fixes #185, installs html5shiv/respond and downgrades jquery for ie8
Losslessly compress images.

Before: 946 KB (969.290 bytes)
After:  743 KB (761.347 bytes)
Compress lesscss.jpg with kraken.io.

Savings 618 bytes.
Convert images to 8-bit.

Before: 743 KB (761.347 bytes)
After:  405 KB (415.638 bytes)
package.json: use the https repo URL.
Merge pull request #187 from XhmikosR/package.json

package.json: use the https repo URL.
Tweaks
Merge pull request #186 from XhmikosR/gh-pages

Compress images
Merge pull request #188 from GrahamCampbell/gh-pages

Tweaks
Critical fix
Merge pull request #189 from GrahamCampbell/gh-pages

Fix repo url in package.json
slate: removes border from btn-link, fixes #192
cosmo, yeti: fixes #196, negative border-radius
add alert about v3 to v2 page
add rel=nofollow to footer links and missed ads
update version 2 title and alert text
Added link to Grunt CLI in help index.html
Merge pull request #202 from siruguri/gh-pages

Added link to Grunt CLI in help index.html