Fix viewport unit bugs and enables using them inside calc function

Activates only on :

• iOS < 8
• Safari < 8

For each stylesheet with vunit-fix attribute, it retrives text content of the CSS file, proceeds a simple regex to replace numbers in vh, vw, vmin or vmax unit with numbers in px according to client viewport dimensions and finally injects that new CSS string into a style tag positionned just like the stylesheet. It does the same for style tags in head.

Corrects values by triggering events and with a setInterval

• Target devices / navigators
• Regex recognition of the viewport units
• A lot of things I may have done wrong