Log Message:
Changes 1.2.0:
* Add :meth:`~parsel.selector.SelectorList.get` and \ 
:meth:`~parsel.selector.SelectorList.getall`
  methods as aliases for :meth:`~parsel.selector.SelectorList.extract_first`
  and :meth:`~parsel.selector.SelectorList.extract` respectively
* Add default value parameter to :meth:`~parsel.selector.SelectorList.re_first` \ 
method
* Add :meth:`~parsel.selector.Selector.re_first` method to \ 
:class:`parsel.selector.Selector` class
* Bug fix: detect ``None`` result from lxml parsing and fallback with an empty \ 
document
* Rearrange XML/HTML examples in the selectors usage docs