Fix for #8, and added fill and stroke color classes

[nagyf]

Hi!

My changes:

• I've added fill and stroke color classes to be able to use your solution in svg styling.
• I've also fixed the issue bower.json main file #8 temporarily, but you may consider to change the value according to the bower specification: https://github.com/bower/spec/blob/master/json.md#main

It states:

• "Do not include minified files." (I've removed it in my commit, as you can see)
• "Use source files with module exports and imports over pre-built distribution files"

I think it means you should set main in bower.json to "material-design-color-palette.less", but I didn't want to make this change, it's your decision.