Converted spans to actual labels.

Instead of the spans being used as improvised labels, actual labels are
now created. Input elements' id's are used as for attribute value when
present, otherwise a 4 character id is used. A check is implemented, to
make sure the 4 character generated id is unique within the dom.
Minified the source, changed date.
Changed demo html back to the minified version.
Small readability improvement.
Added support for textarea

Merged https://github.com/megalithic/JVFloat.js
Merge pull request #8 from MrSnowflake/master

JVFloat now creates actual label elements.