revert default HTTP cache policy to dummy (instead of RFC2616)
get rid of assertDictEqual (since it's python 2.7+ only)
added remove_namespaces() method to XmlXPathSelector objects
improve documentation about removing namespaces
Correct init bag for load old scrapy.contrib.httpcache.FilesystemCacheStorage
Merge pull request #227 from tonal/correct-old-cache

Correct init bag for load FilesystemCacheStorage from old location
remove unused imports
fixes spelling errors in documentation
Merge pull request #229 from christilden/master

fixes spelling errors in documentation
Add 0.16.4 to release notes

Conflicts:
	docs/news.rst
simplify InitSpider implementation, fixing one bug (closes #228) and adding support generators return from start_requests() (which the previous version didn't)