Add costructors to LineParser.

Tests/LineParserTest.cs

@@ -55,8 +55,7 @@ namespace Tests
         [Test]
         public void ParseLineWithQuotesAndPunctuation()
         {
-            LineParser lp = new LineParser();
-            lp.Line = "this-is \"a , simple ;\" line";
+            LineParser lp = new LineParser("this-is \"a , simple ;\" line");
             Assert.AreEqual("this-is", lp.Fields[0]);
             Assert.AreEqual("a , simple ;", lp.Fields[1]);
             Assert.AreEqual("line", lp.Fields[2]);