Remove apostrophes from generated BibTex keys

[tobiasdiez]

JabRef version: latest master on Windows 10

• I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

Steps to reproduce the behavior:

1. Have an author with the name Arnolʹd
2. Generate key to get something like Arnolʹd2000

The apostroph ʹ should have been removed from the key.

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[Siedlerchr]

Fixed in aab77a1