Multiple select boxes are now handled a lot better.
* You can now select more than one field (where as previously, the last one select would override previous selections)
* You can now unselect a value. It works like select, takes the same params, but removes the selection value
Issues regarding ampersands in values have been resolved.
* Values are now unescaped when the to_param method is run on elements, to make assertions less complicated
* Locating an option with ampersand values now works as expected (it will check for both escaped and unescaped occurrences)
Bunch of new specs and 3 broken pending ones have now been fixed. [#145 status:resolved]
