Added jsDocs. Added method 'data' to get value data-some-attr of tags. Refactored firstChild, lastChild, next, prev, nextAll, prevAll, first, last, index, not, above, below, even, visite, hidden, checked, disabled, selected, uneditable, unchecked, enabled, unselected, editable methods
License copyright dates are updated
Browser api php script was refactored
Plugins were ligth refactored