Changing license from 3-clause BSD to Apache

As discussed over much time within Cray and on the Chapel mailing
lists, we are moving to the Apache License (and, in a separate
commit, contributor agreements) in order to move away from our
previous homegrown contributor agreements while getting a similar
level of protection from a standard form.  Hopefully this will
make the lawyers of the world happy without making any users sad.
Update Contributor Agreement Licenses to Apache.
Adding linefeed at end of file
Merge pull request #15 from bradcray/bsd-to-apache-license

Changing license from 3-clause BSD to Apache
Use more consice filenames for CLA PDF files.
Merge pull request #14 from thomasvandoren/apache-license

Update Contributor Agreement Licenses to Apache.