Fix #100 - ability to define scale factor

[soswow]

Not sure what should be done. project is a bit messy, bower_components not in place (tests are not working), jslinting is out of control, /build for some reason checked in but it's in .gitignore ... not sure. My changes do the trick of changing scale.

[bramp]

Thanks for the work.

Not sure why the tests are now broken, Travis was able to build them previously. You should just type 'make', and it fetches all dependencies, builds, checks for lint errors, and runs tests.

Anyway, not near my computer right now, so I will review shortly.