Starting with standard image sizes: ntsc.
lil' refactor.
New standard image size: PAL.
New standard image size: HD720.
Set default sizes in a static array.
Refactor default image size tests.
New standard image size: HD1080. It's 1920x1080, so '`e updated the max width/height value from 1500px to 2000px (including out of bound tests).
Refactorin default image size tests.
Move max size to a constant.
New constant: background color.
Added functional tests for default image sizes.
Updating homepage with standard image size info.
Improve documentation.
Improve readme.