Chitwanabm

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- Store ChitwanABM version module in module __version__
- Minor documentation revisions
- Add functions for modeling NFO change.
- Remove deprecated alternative models for marriage, first birth timing, and
migration.
- Remove saving of pickled intialization files.
- Optimize model for speed.
- Update dependencies to run on a default Amazon EC2 instance.
- Add new verification script to verify person agent attributes over course of
a model run.
- Update runmodel to allow passing model run ID as a command line parameter
(helpful on EC2).

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- Fix PyPI homepage so like to pyabm homepage is working.
- Add details to docs.
- Update batch R script to handle cases where results files are missing from
some model run folders (due to cancelled or failed runs, for example). Rather
than failing, the script will now print a warning and skip each run with a
missing result file.
- Change sleep time in ``threaded_batch_run.py`` to 10 seconds instead of 5 to
allow more time for writing world files so different threads don't try to
write to the same files at the same time.

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- Add in missing chitwanabm.rst doc file that was accidentally removed from
prior release.
- Miscellaneous doc updates.

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- Finalize divorce code.
- Fix bug where household was not destroyed properly if it became empty due to
the death of the last returning outmigrant.
- Fix KeyError that ocurred when mothers or fathers were excluded from CVFS
data (f663ce1ac77c8e2803084b6db9ba1c9a442f0aa9).
- Restructure layout of code to support uploading to PyPI and installation with
``distribute``.
- Many other small improvements and bugfixes. See git log for details.

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- Release for PIRE 2012.

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- Release for PIRE 2011.