Rename author 'K. Zickfeld' to 'Kirsten Zickfeld'

She contributed in AR5 WGI, Ch12 and Ch13, and in AR3 WGII, Ch19
"Vulnerability to Climate Change and Reasons for Concern: A Synthesis":
http://www.sfu.ca/geography/people/faculty/kirsten-zickfeld

This name appears in AR5.