Added diamond svg. 1 down, 3 to go.
Changed coordinates in svg to whole digits, multiples of ten

This fixes #24
Added heart image
Changed shadow colour of diamond image
Shrunk SVG files to 32x32.\n\nMade the 320 coordinates into 32 coordinates.
Added Spades file. 3 down, 1 to go.

Spades file created. The next one is the difficult one. :(
Added Clubs file.

That's all of them!
Merge pull request #25 from r2vq/add-suits

Add suits