Eprints2bags

* Fixed issue 9: out-of-order id lists are ignored.
* Added fix by [Tom Morrell](https://github.com/tmorrell) to `files.py` for when output is in the current directory.
* Changed the debug option `-` to accept an argument for where to send the debug output trace. The behavior change of `-` is not backward compatible.
* Internally, package metadata is now stored in `setup.cfg`. Also, there is no `eprints2bags/__version__.py` anymore, and instead, some special code in `eprints2bags/__init__.py` extracts package-level variables directly from the installation created by `pip`.
* Redesigned the icon for `eprints2bags` to tie into Eprints a little bit better.
* Changed Caltech logo used on the bottom of the README.md file. The previous logo is only approved by Caltech for use in certain official contexts.
* Fixed various small errors in the README.md file.
* Released on PyPI.

* Improved handling of network and server connectivity issues (fixes issue 6)

* Significant performance improvement due to using multiple processes more efficiently

* New feature: provide the option to create a final, single top-level bag out of all the output (option `-e`)
* New feature: use multiple processes for bag creation and provide option `-c` for adjusting the number
* New command-line options `-b`, `-c`, `-e` and `-t`
* Previous option `-b` renamed to `-n`, and `-m` to `-k`
* Option `-B` removed (because it's now subsumed by other options)
* Slightly changed (again) the comment block written to the ZIP archives
* Fixed some bugs
* Updated help strings and text in README

* Added new `--status` command-line option
* Fixed comments in ZIP file to use correct BagIt format version
* Updated help strings and text in README

* Added new `--lastmod` command-line option
* Fixed failure to parse combinations of ranges passed as arguments to `-i` option
* Slightly changed the comment block written to a zip archive to make it more specific
* Updated help strings and text in README