Add a guide line for package descriptions
Added platform field description to the Configurations section
Merge pull request #71 from ColdenCullen/patch-1

Added description of the platform field to the Configurations section
Added Markdown CSS.
Update links to point to dlang.org repositories
Update usage.dt to refer to dub.json instead of package.json
Merge pull request #73 from JakobOvrum/docs

A couple of documentation updates
Merge pull request #69 from lgvz/pkgdescnote

Add a guideline for package descriptions
Added license to markdown.css
Merge pull request #72 from PxlBuzzard/master

Added Markdown CSS
Fix compilation for latest UserMan changes.
Change package registration URL to not collide with a "register" package. See #63.
Fix error display (use Json.get!string instead of .toString).
Remove gray background from the readme section of the package page.
Fix the "Register new package" link under "My packages". Fixes #75.