Improved read from the InputStream. Or use (org.apache.commons.io.IOUtils.toByteArray())

To prevent the following exception on oxalis-statistics-public.key loading


java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException: Detect premature EOF
	sun.security.rsa.RSAKeyFactory.engineGeneratePublic(RSAKeyFactory.java:188)
	
java.security.KeyFactory.generatePublic(KeyFactory.java:304)
	eu.peppol.security.StatisticsKeyTool.publicKeyFromBytes(StatisticsKeyTool.java:164)