spider.log to pass keyword arguments into twisted log.msg
Fix url_has_any_extension bug
Merge pull request #241 from zuhao/master

Fix url_has_any_extension bug
reverted previous changed as it broke tests
added --pdb command option to enable pdb debugger on failure.
updated release notes with previous commit
Added check so that genspider cannot create a spider with the same name as the project.
Merge pull request #244 from morty/master

scrapy genspider allows you to create a spider module with the same name as the project
Merge pull request #240 from llonchj/spider_log

spider.log to pass keyword arguments into twisted log.msg
doc: remove links to diveintopython.org, which is no longer available. closes #246