changed copyright notice as per issue #47
Also stripped trailing whitespaces and fixed <docs/build.md> so it
refers to the correct GitHub URL for StigDB.
Here, have these, then.
Merge remote-tracking branch 'upstream/pr/48'

Conflicts:
	stig/indy/disk/file_service.cc
	stig/indy/disk/file_service.h
	stig/indy/disk/file_service.test.cc
	stig/indy/disk/result.h
	stig/indy/disk/util/volume_manager.cc
	stig/indy/disk/util/volume_manager.h