Baseline download fails

[Pidgeot]

Running from source, in the 40_23 starter pack (with manually-added baseline removed):

Error downloading http://www.bay12games.com/dwarves/df_40_23_win_s.zip
Traceback (most recent call last):
  File ".\python-lnp\core\download.py", line 160, in __process_queue
    total = response.info().getheader('Content-Length')
AttributeError: 'HTTPMessage' object has no attribute 'getheader'

Running the built v0.9 win32 version, everything works as expected.

[Issue created by PeridexisErrant: 2015-01-10]

[Comment created by Pidgeot: 2015-01-10]
Fix Python3 compatibility of download queue system (fixes #51)

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