Merge pull request #2 from Ensembl/relicense_to_apache2

[ENSCORESW-3122] Relicense Zircon from GPL to Apache-2.0

LICENSE

-Zircon is free software and is distributed under the terms of the GNU General Public License.
 
-Zircon should be credited to "Genome Research Ltd."
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NOTICE

+Copyright [2012-2018] Genome Research Ltd
+Copyright [2019] EMBL-European Bioinformatics Institute
+
+This product includes software developed at
+EMBL-European Bioinformatics Institute (https://www.ebi.ac.uk)
+and the Wellcome Sanger Institute (https://www.sanger.ac.uk).