rename "sflo" local variables to less cryptic "log_observer"
Merge pull request #775 from kmike/rename-sflo

rename "sflo" local variables to less cryptic "log_observer"
PY3 make it possible to run some tests in Python3

* switch to Twisted 14.0.0 because SVN version broke twisted.log in Python 3;
* skip top-level shortcuts to make at least some tests pass;
* use PY3 compatible import of _monkeypatches.
Deprecate scrapy.python.utils.FixedSGMLParser

SGML link extractor that uses it is also going to be deprecated;
sgmllib module is not available in Python 3.
deprecate SgmlLinkExtractor
Merge pull request #776 from kmike/py3-tests-fix

PY3 make it possible to run some tests in Python3
FixedSGMLParser is useless.
Remove FixedSGMLParser: it is both useless and unused.
Merge pull request #777 from scrapy/deprecate-sgml

Deprecate SgmlLinkExtractor
Merge pull request #779 from Digenis/master

selector.__repr__ test
fix typo
fix a couple of typos in sep-19
Fixed Python syntax in tutorial.
Merge pull request #786 from zsiciarz/patch-1

Fixed Python syntax in tutorial.