Added protected quoted string output for field values with @ sign.

git-svn-id: http://bibstuff.googlecode.com/svn/trunk@59 4b3877a5-4c1d-0410-b779-7f4527a406ac
handle nested braces; handle harvard style; add function 'get_braces_contents'

git-svn-id: http://bibstuff.googlecode.com/svn/trunk@60 4b3877a5-4c1d-0410-b779-7f4527a406ac
Merge remote-tracking branch 'svn/master'

Merge from SVN upstream

* svn/master:
  handle nested braces; handle harvard style; add function 'get_braces_contents'
  Added protected quoted string output for field values with @ sign.

Conflicts:
	setup.py
BF: fix relative import error for nosetests

I was putting some directories on the path using sys.path; this seemed
to conflict with relative imports of modules in the path just added.