fixed #881: Build system does not create app/log folder in new projects
merged 42eb9c11fed3906f08c564a643ce9268fd54e25d...42f53a9fc7740caa3fc960d3e5e5bcc407d12371 (from 0.11) (really just ported b20f5e0f97e18f0a187903fb3e3ebc9a44a75225, refs #881)