Python-dwca-reader

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- Updated Darwin Core terms for the qualname helper (including Event Core).
- Updated dev. script (https://github.com/BelgianBiodiversityPlatform/python-dwca-reader/issues/45).

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- API new: DwCAReader.open_included_file(relative_path).
- InvalidArchive exception is now raised when a file descriptor references a non-existing field.

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- Support for new types of archives:

* DwCA without metafile (see page 2 of http://www.gbif.org/resource/80639), including or not a Metadata document (EML.xml). Fixes #47 and 7.
* DwCA where data fields are enclosed by some character (using fieldsEnclosedBy when the Archive provides a Metafile, autodetection otherwise). Fixes issue 53.
* Archives without a metadata attribute in the Metafile. See 51.
* Tgz archives.

- API change: SectionDescriptor => DataFileDescriptor
- API change: DataFileDescriptor.encoding => DataFileDescriptor.file_encoding
- API change: the reader previously only supported zip archives, and raised BadZipFile when the file format was not understood. It nows also supports .tgz, and throw InvalidArchive when the archive cannot be opened as .zip nor as .tgz.
- API new: DataFileDescriptor.fields_enclosed_by
- API new: DwCAReader.use_extensions

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- Support for archives contained in a single (sub)directory. See https://github.com/BelgianBiodiversityPlatform/python-dwca-reader/issues/49

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- Experimental support for Python 3.5 (while maintaining compatibility with 2.7)

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- Python-dwca-reader doesn't rely anymore on BeautifulSoup/lxml, using ElementTree from the standard library instead fot its XML parsing needs. This has a series of consequences:
* It should be easier to install and deploy (also on platforms such as Jython).
* All methods and attributes that used to return BeautifulSoup objects will now return xml.etree.ElementTree.Element instances. This includes DwCAReader.metadata. SectionDescriptor.raw_beautifulsoup and ArchiveDescriptor.raw_beautifulsoup have been replaced by SectionDescriptor.raw_element and ArchiveDescriptor.raw_element (Element objects).