Add Configuration to Validate Copyrights Are Present on All Files

[romeara]

Add specification and automated validation that copyrights be present in all files. This requirement should be included in contributor documentation, and checks for it should be automated within projects.

One way of automating this is the Checkstyle RegexpHeaderCheck Rule, with a header specification file such as:

/\*$
\W\* Copyright \(C\) \d\d\d\d [email protected] Authors$

(for MIT licensed projects)

[romeara]

A note of this is added in #18, but issues should be filed to setup automation in project repositories before this issue is closed