Use compliant API for Less

[Friedrich von Never]

I've found that the way I'm trying to use dotless is (suddenly) not compatible with C#. See dotless/dotless#179 (comment).

Need to replace it with the recommended way (like this):

var config = new DotlessConfiguration();
var engineFactory = new EngineFactory(config);
var engine = engineFactory.GetEngine();
engine.CurrentDirectory = path;

var filePath = Path.Combine(path, fileName);
var content = File.ReadAllText(filePath);
var result = engine.TransformToCss(content, fileName);

[Friedrich von Never]

Obsoleted by #49.