BUG: Fixes issue #256 - Incorrect SVG file generation

Emperor was generating incorrect SVG files that tools like Adobe Illustrator would not be able to open (see #256). This has been fixed.

The legends file had a monospace font, but this has been changed as it seems to be a non-standard feature. Additionally the formatting of the colored-squares now has a visible black stroke line, see the example below:

Before
![screen shot 2014-09-05 at 4 20 52 pm](https://cloud.githubusercontent.com/assets/375307/4172938/6aeb6474-3551-11e4-9f49-7ad58efd3477.png)

After
![screen shot 2014-09-05 at 4 30 09 pm](https://cloud.githubusercontent.com/assets/375307/4172940/6d412a9c-3551-11e4-8f1b-95100ab6561f.png)