typo fix and add a link to the project page

Ignore-this: 1a60306140d2188e96e797b94dc0f9d7

darcs-hash:20140828191833-fae1a-1204c604ad4a9699d40903b8042dfc52090d9173
implement the -left -right -top -bottom variations for padding, margin, border-width and border-color

Ignore-this: 550f9b5556bd9808959ee4150d8cfd41

darcs-hash:20140829204805-fae1a-5f4593447643281d96260c6f9aa890db494d775e