#1414: Adjust zoom via keypad +/- keys.
#1414: Adjust zoom via keypad +/- keys.


jimbonator/shotwell,jof/shotwell,jof/shotwell,h4ck3rm1k3/shotwell,h4ck3rm1k3/shotwell,damianmoore/shotwell,Sanva/shotwell-gsoc,jof/shotwell,h4ck3rm1k3/shotwell,ritchiewilson/shotwell,abrauchli/shotwell,polymeris/shotwell,polymeris/shotwell,ritchiewilson/shotwell,abrauchli/shotwell,polymeris/shotwell,Sanva/shotwell-gsoc,ritchiewilson/shotwell,damianmoore/shotwell,abrauchli/shotwell,damianmoore/shotwell,jimbonator/shotwell,jimbonator/shotwell,Sanva/shotwell-gsoc