Update configuration.py

comment on link to GO data
Update parsers.py

Added HT PM-only arrays to Affy parser
add default encoding + warning for gene namespaces

closes #18
closes #13
error caused by adding ns as key

closes #6
update go obo-xml file date
update GO obo-xml file date
info to use for generation of .belns and .beleq file headers
see #10
Merge branch 'master' into synonyms