Add tests for OffsiteMiddleware() + use re.escape() in domains regexp
Merge pull request #478 from redapple/offsitetests

Add tests for OffsiteMiddleware() + use re.escape() in domains regexp
Make Filesystem storage backend default again. See GH-500.
Merge pull request #541 from kmike/fs-as-default-cache

[MRG] Make Filesystem storage backend default again.
Merge 0.22.0 release notes
bump version to 0.23
fix typos in news.rst and remove (not released yet) header
fix 0.22.0 release date
modify the version of scrapy ubuntu package

latest version is 0.22.
with scrapy-0.18, tutorial project provides error
relative issue : https://github.com/scrapy/scrapy/issues/511
Update Ubuntu installation instructions
fix apt-get line
replace warning about updating package lists by a note on package upgrade
Merge pull request #549 from dangra/509-scrapy-apt-repo

[MRG] update instruction to install using ubuntu packages
show ubuntu setup instructions as literal code
Merge remote-tracking branch 'upstream/master'