0.3.0
Added pngToPdf function to Massage

- Takes in a png and a DPI and converts to a PDF
- 100% Coverage
Change pngToPdf to support all image types
Rewrite method to use callbacks

- 100% coverage all day every day.
update package.json
Add in return statements to test.js
Rearrange order of tests
Throw exported error in imageToPdf