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
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
port all scrapy commands to new CrawlerProcess
typo
fix some missing logs with new crawlerprocess
fix log intermixing in scrapy shell command
remove redundant kwarg
fix XmlItemExporter in Python 2.7.4 and 2.7.5
Merge pull request #372 from kmike/xml-exporter-fix-for-2.7.4

fix XmlItemExporter in Python 2.7.4 and 2.7.5
fix retry middleware which didn't retry certain connection errors after the upgrade to http1 client, closes GH-373