Add filter for non-200 GET requests

This will filter out any requests that are not GET requests with a 200
response.
Convert Apache log request string into URL.
Add filesize to request object
Downgrade apachelog

The build is failing on travis because it can't find apachelog 1.1.
Looks like the new version of pip no longer looks at 3rd party urls by
default. The tests pass when using apachelog 1.0 so we'll just go with
that.
Merge pull request #6 from gravesm/master

Adds missing fields and filtering for successful 200 requests