Plugininstall accept URLs ending with .zip (case insensitive) only
Plugininstall accept URLs ending with .zip (case insensitive) only

-Addresses #935

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry