Add library creation year to the license docblock in each file

[aik099]

Reference: http://www.copyright.gov/circs/circ01.pdf (page 4)

Before: @copyright Alexander Obuhovich <[email protected]>
After: @copyright 2013 Alexander Obuhovich <[email protected]>

[aik099]

@stof , do you have any experience with what is considered a valid license comment? Is year really necessary to make license valid?

[stof]

I don't know

[aik099]

I've also asked on Twitter, but nobody replied. Some of libraries have year in licensing comment, some don't.