fix a possible error in contracts post hook
command with multiple crawlers, fix check command
disable logging for scrapy check
also fetch alternate URLs from sitemaps, see #360
fixed scrapy.utils.gz.gunzip() broken after changes from Python 2.7.3 to 2.7.4
updated release notes and bumped version to 0.18.0
bumped version to 0.19.0
fix contributters list format
tox.ini: disable sitepackages on windows, as a compiler is often not available
adjust http11 pool size to per-domain concurrency
added a python native classes item exporter
Merge pull request #366 from kalessin/exporter

added a python native classes item exporter
minor updates to 0.18 release notes
add docstring to PythonItemExporter
#327 - Support STARTTLS / SSL option in email sender
Merge pull request #367 from berendiwema/master

#327 - Support STARTTLS / SSL option in email sender
FilesPipeline which enalbes to download any files.
It has been extracted from ImagesPipelines.
ImagesPipeline is built on top of FilesPipeline and consist only with convert image and thumbnail generation logic.
Test reorganization and new tests for Files and Images Pipelines, PEP8 changes in MediaPipeline
Recommend Pillow instead of PIL. Closes GH-317.
default to multi crawler commands

compatibility for old single crawler process
deprecated command's `crawler` property
logs about settings only shown once