Allow for duplicate keys and ensure Mono compat.
Fixed two bugs

Fixed two bugs related to parsing ...

1.) BibTeX records with a whitespace before the citation key crashed the
parser
2.) There was a typo in the whitespace removal procedure which could
lead to a truncation of characters
Changed line endings
Line ending normalization turned off
Solved conflict
Merge pull request #1 from IngoScholtes/master

Some minor improvements