telnet client: fix unexisting reference to engine.slots
Merge pull request #464 from kalessin/telnet

telnet client: fix unexisting reference to engine.slots
Deprecate body_or_str helper function only used by xml iterators
Add note to item-pipeline documentation explaining order in the ITEM_PIPELINES setting.
Do not call body_as_unicode on non text responses. closes #462
lxml is required, no need to skip tests.
add a tox env for Python 3.3
Elaborate on use of order numbers
Merge pull request #465 from bjlange/master

Add note to item-pipeline documentation explaining order
allow to use settings for defining http error handling defaults
Merge pull request #466 from kalessin/httperror

allow to use settings for defining http error handling defaults
better names for HANDLE_* settings, and added doc
Modify ItemLoader to support XPath and CSS selectors

Deprecate XPathItemLoader (now an alias to the new ItemLoader)