removed cookielib

cookielib was not used
Added logging facilities, support 'fpr dx.doi.org' ++

# Resolving a bug on determining type of media in citation.py
# Improved the way range of pages in bibtex are interpreted
# bibtex.py is now able to get "DOI" data
# all html messages are now stored in module html
# there was bug in detecting undefined URLs which is fixed now
# Added a little configuration data to README file
added support for direct doi input