Fix a bug in bibtex parsing.

Would bug if last field was ended by a comma.

	  * bibtexentry.py: Here.
Add a message when search return 0 results.

	* gitbib.py: Here.
Fix a bug in parsing fields with no delimiting braces or double quotes.

	* bibtexentry.py: Here.
Fix bug when script is not called from its own folder.

	* bibtexentry.py: Removed buggy () on a string.
	* Expand the ~ for stuff in config file.
	* gitbib.py: Retrieve config file from the script folder
	  			 (changed name to default.cf)
Fix error: (missing import)

	* config.py: Missing import os