Resolved issue #546. Output format parsing from filename extension.
Added back `-t` option. If `--output-format` not defined parse from extension `--output`
Fix default value.
Add import os for crawl.
Added content-type check as per issue #193
fixed typo
Redefined test for #193
Merge pull request #660 from rubenvereecken/issue193

Added content-type check as per issue #193
Added more verbose error message for unrecognized output format. PEP8.
Fixed SgmlLinkExtractor constructor to properly handle both string and list parameters (attrs, tags, deny_extensions)
Merge pull request #661 from ananana/sgml-attrs-tuple

Fixed default value of attrs argument in SgmlLinkExtractor to be tuple
try to restore pypy tests
Fixed XXE flaw in sitemap reader
Merge pull request #674 from dangra/pypy

[WIP] try to restore pypy tests
Run testsuite with py.test
Fixed XML selector against XXE attacks
Added test against XXE attacks for Sitemap
Added resolve_entities to kwargs in SafeXMLParser
make scrapy.version_info a tuple of integers
 Trial functionality for running tests with pytest

  * Change current dir to tmp dir on each test run
  * Log twisted with test.log