Adding tests for SVG and fixing height/width bug

[jlyonsmith]

• Reduced code by putting attributes in a local
• Add { } around if's to make code friendlier to code coverage
• Add more unit tests to get to 57.4%
• Fix height/width bug in svgTagRender (using width for height)
• Add height/width to the svgDataImagerRender for Picture.string
• Refactored unit tests to simplify and reduce code
• Add coverage and scratch directories to .gitignore

[jlyonsmith]

Is there nobody out there to approve this merge?

[jlyonsmith]

scratch/ directory removed

[Sub6Resources]

I'm gonna merge this now actually and resolve conflicts in #1176