Switch to the real distribution type names and add missing ones
Use urlparse instead of splitting on #
Handle malformed log lines
Skip .asc files
Ignore .asc files completely
Uncomment the logger
Exit the log processer when there are no more lines of input

The rsyslog docs state:

    If rsyslog terminates, the program's stdin will see EOF. The
    program must than terminate.

This change makes ``warehouse download-statistics process-logs``
compatible with that.
Fix the tests
Merge pull request #186 from dstufft/download-statistics-cleanup

Clean up and Refactor Download Statistics