process.exit(1) makes it hard to use node-elm-compiler via require()

[kachkaev]

It'd be great a call to process.exit(1) was removed to make it possible to use the module via require()

node-elm-compiler/index.js

Lines 96 to 105 in 40c832b

	try {
	return runCompiler(sources, optionsWithDefaults, pathToMake)
	.on('error', function(err) {
	handleError(pathToMake, err);
	process.exit(1);
	});
	} catch (err) {
	handleCompilerError(err, pathToMake);
	}

There is another occurrence of this method, but the line is never reached:

node-elm-compiler/index.js

Lines 69 to 78 in 40c832b

	function handleCompilerError(err, pathToMake) {
	if ((typeof err === "object") && (typeof err.code === "string")) {
	handleError(pathToMake, err);
	} else {
	console.error("Exception thrown when attempting to run Elm compiler " + JSON.stringify(pathToMake) + ":\n" + err);
	}
	throw err;
	process.exit(1);
	}