add labelOptions property and accessors
add label's disable_escape option handling
revert BC in ElementTest
add ElementInterface duck typing and @todo
fix code indentation
moar indentation fixing
add LabelAwareInterface and Trait

So I added the interface as @mwillbanks suggested, and a trait too while
i was at it. I made the interface a bit more generic, that introduced
some redundancy with ElementInterface, but i guess the two will
eventually get merged in zf3.
Merge pull request #4677 from stefanotorresi/form-label-options

Add Form\Element labelOptions property w/ implemented use case
[#4677] PHP 5.3.3 compat

- Removed set/getLabel from new interface
- Renamed interface to LabelOptionsAwareInterface
- Renamed trait to LabelOptionsAwareTrait
- Updated code to reference renamed interface
Merge branch 'feature/4677' into develop

Close #4677