Add ASF license headers to all Scala .conf files. (#21)

.scalafmt.conf

+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements; and to You under the Apache License, Version 2.0.
+
 style = intellij
 danglingParentheses = false
 maxColumn = 120
 docstrings = JavaDoc
 rewrite.rules = [SortImports]
-project.git = true
\ No newline at end of file
+project.git = true

tests/src/test/resources/application.conf

+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements; and to You under the Apache License, Version 2.0.
 
 whisk.spi {
   SimpleSpi = whisk.spi.SimpleSpiImpl