Added doc-cp clean to clean-local target

This is part of the build for the website branch
Altered license templates for combined files with section 7 exception

As suggested by RMS in The JavaScript Trap:
  <https://gnu.org/philosophy/javascript-trap.html>

This does increase the size of the minified file a bit---the header is now
about 1kB of uncompressed text (which will hopefully comprses nicely with
the rest of the minified file). That said, ease.js will be continuing to
grow in size, bandwidth is becoming less and less important, and the license
is very important, especially in our goal to spread the philosophy of
software freedom.
dist targets now create and package minified files
Updated copyright script to include all copyright years in license templates

This increases file size even further, so eventually we may want to add
ranges. That said, it's not that significant, and helps to make the life of
the project prominant.
[copyright] Copyright update
Corrected new Closure Compiler warnings