Added context to code example of composer.json

If someone wasn't super familiar with composer they may think that your code sample was the contents of composer.json and not just rows to add to require.  This adds context so it's clearer where they would go in composer.json.
Merge pull request #8 from andrewshell/patch-1

Added context to code example of composer.json
Correct link to sculpin website on GitHub

The link for the sculpin website repo was incorrect so I changed it to the correct one.
Merge pull request #9 from andrewshell/patch-2

Correct link to sculpin website on GitHub
Remove sculpin.phar; oops.
Added asm89 and qandidate.
Spelling fixes in documentation.md
Merge pull request #10 from stevector/master--spelling-fixes-in-documentation.md

Spelling fixes in documentation.md
No more required deps!
Updated deps.
add adrianschneider.ca to powered by list
Merge pull request #12 from AdrianSchneider/addAdrianSchneiderCa

add adrianschneider.ca to powered by list
Add thorpesystems to list of sites using Scuplin.
Merge pull request #13 from trq/feature/add-thorpesystems

Add thorpesystems to list of sites using Scuplin.
Changed color to increase contrast thanks to suggestion from @trompette; bumped assets version.
Remove syntax highlighter
Changed colors for code blocks.
More contrast.
Add Palantir Holiday site to the list of sites using sculpin.
Merge pull request #14 from aCyborg/master

Add Palantir Holiday site to the list of sites using sculpin.