Added new Class for corporation data representation.
Added new method parseCorporations() and getCorporations().
Fixed bug in parsing of authors names.
MARCXMLRecord rearranged little bit.
  .parseCorporations() moved to ._parseCorporations()
  .parsePersons() moved to ._parsePersons()
Conversion functions (toEpublication() etc..) moved to convertors.py.
Refactored names of parameters in some functions.
Added some docstrings.
Added range checks in methods where it is possible.
Added lot of getters, some documentation, _undefinedPattern():
  getName()
  getSubname()
  getPrice()
  getPart()
  getPartName()
  getPublisher()
  getPubDate()
  getPubOrder()
  getFormat()
  getPubPlace()
  getISBNs()
  getBinding()
  getOriginals()
toEpublication() converted to use new MARCXMLRecord getters.
Added .title property to Authors.
marcxml.py is now probably in version 1.0.
Added LOT of documentation, description and so on.
Dostring from MARCXMLRecord moved to module level.
Files from test/resources moved to test/resources/aleph_export_template.
Small bugfix in Authors names parsing.