Changes in the way options/attributes are handled

[mtancoigne]

I started a work around the way the $options arrays and the tag attributes are handled: for now, they bring a lot of manual checks in methods (for the options) and generates empty attributes or bad ones (see #10 )

I won't check if attributes are correct for the given tag, bu re-work on this part of the code in the next 24h... Please wait to commit :)