Mrjob

* Added debian packaging
* mrjob bootstrapping can now deal with symlinks in site-packages/mrjob
* MRJobRunner.stream_output() can now be called multiple times

* Fixed small bugs that broke Python 2.5.1 and Python 2.7
* Fixed reading mrjob.conf without yaml installed
* Fix tests to work with modern simplejson and pipes.quote()
* Auto-create temp bucket on S3 if we don't have one (Issue 16)
* Auto-infer AWS region from bucket (Issue 7)
* --steps now passes in all extra args (e.g. --protocol) (Issue 4)
* Better docs