GPII-91: Updated build.cmd to work properly with npm on windows.
GPII-91: Updated build.cmd to work properly with npm on windows.

klown/windows,colinbdclark/windows,colinbdclark/windows,klown/windows,GPII/windows,OpenDirective/GPII-windows,OpenDirective/GPII-windows,minogian/windows,amb26/windows,minogian/windows,gloob/windows,gloob/windows,OpenDirective/GPII-windows,OpenDirective/GPII-windows,klown/windows,javihernandez/windows,colinbdclark/windows,klown/windows,minogian/windows,GPII/windows,amb26/windows,colinbdclark/windows,gloob/windows,gloob/windows,javihernandez/windows,minogian/windows,amb26/windows,amb26/windows