License and file headers

[robertvazan]

This issue is a low priority reminder that license template must be actually filled in for the license to be valid. File headers must point to this filled in license in the repository instead of the online template. For Apache License, file NOTICE (or NOTICE.txt) should be probably included as well.

While at it, move file headers above package declaration. Otherwise Eclipse (and perhaps other IDEs) thinks the comment is attached to import statement and moves it around when using Organize Imports tool.