fix(client/js/templating.js): Unchecked error in console on preview render failure
feat(*): #646 image validation code & documentation
chore(test/uploader-demo-jquery.js): remove temp code in test file

[skip ci]
docs(*): image validation values are in pixels

[skip ci]
test(test/functional/TODO.txt): closes #646 Note to write functional image validation tests

This is, unfortunately, far too painful to do with unit tests.

[skip ci]
docs(client/js/uploader.basic.api.js): typo
test(*): #646 unit tests for image validation!
test(test/static/blob-maker.js): #646 minor adjustment to download file helper
[skip ci]
test(*): exclude Android from image validation tests, safari 5.1 from some ui event handler tests
chore(*): increment build number