Added SVG legend for months.
Added SVG legend for months.

Next step: abstract into a function, and use for the day names as well.

Kitware/tangelo,ecohealthalliance/tangelo,aashish24/tangelo,mathstuf/tangelo,Kitware/tangelo,mathstuf/tangelo,ecohealthalliance/tangelo,mathstuf/tangelo,ecohealthalliance/tangelo,aashish24/tangelo,aashish24/tangelo,Kitware/tangelo