Log Message:
py-parsel: updated to 1.5.0

1.5.0:
* New Selector.attrib and SelectorList.attrib properties which make
  it easier to get attributes of HTML elements.
* CSS selectors became faster: compilation results are cached
  (LRU cache is used for css2xpath), so there is
  less overhead when the same CSS expression is used several times.
* .get() and .getall() selector methods are documented and recommended
  over .extract_first() and .extract().
* Various documentation tweaks and improvements.