private String renderPackage(File file) {
		final Optional<String> name = fileToClassName(file.getName());
		if (name.isPresent()) {
			final Optional<String> pack = packageName(name.get());
			if (pack.isPresent()) {
				return "package " + pack.get() + ";" + dnl();
			}
		}
		
		return "";
	}
Renders the 'package'-part of the file. In java, the package should only
be present if the file is located in a directory in the sources folder.
If the file is in the global package, an empty string will be returned.
<p>
The package part will be suffixed by two new line characters if a package
was outputted.
<p>
Example: <pre>"package com.speedment.example;\n\n"</pre>

@param file  the file
@return      the package part or an empty string
common-parent/codegen/src/main/java/com/speedment/common/codegen/internal/java/view/FileView.java