"sanitizing inputs" to work around CHEF-5082

Unfortunately 'knife cookbook upload' does not like "Ionuț Arțăriși", throwing
an exception. I've filed https://tickets.opscode.com/browse/CHEF-5082 but in the
meantime we'll have to make Ionut's name match the other READMEs. I apologize
for the US-ASCII-centric implementation.

Change-Id: I43cbc98abd405905de434b0e8c07f72fd98c5982