Correct copyright holders for scala files.

src/main/scala/eu/nomad_lab/parsers/AbinitParser.scala

 /*
-   Copyright 2016-2017 The NOMAD Developers Group
+   Copyright 2016-2018 Micael Oliveira, Fawzi Mohamed
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

src/test/scala/eu/nomad_lab/parsers/AbinitParserSpec.scala

 /*
-   Copyright 2016-2017 The NOMAD Developers Group
+   Copyright 2016-2018 Micael Oliveira, Fawzi Mohamed
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.