tests: added data file and test coverage to demonstrate encodings

The library uses fs.createReadStream to read files when fromFile
is called and passes through options, including encoding, to the
fs call. This is not obvious, resulting in issue #402. I have added
a test to demonstrate this capability and a data file encoded in
latin1 for use in the test.

Issue #402

test/data/dataWithLatin1Encoding

@@ -0,0 +1,6 @@
+Timestamp,Name
+1395426422,b�b�
+1395426422,Jane
+1395426422,Mary
+1395426422,Anne
+1395426422,Hailey

test/testCSVConverter2.ts

@@ -79,6 +79,16 @@ describe("testCSVConverter2", function () {
     });
   });
 
+  it("should parse fromFile with encoding option", function (done) {
+    var csvFile = __dirname + "/data/dataWithLatin1Encoding";
+    var conv = new Converter({
+    });
+    conv.fromFile(csvFile, { encoding: "latin1" }).then(function (json) {
+      assert.equal(json[0].Name, 'bébé');
+      done();
+    });
+  });
+
   it("should fromFile should emit error", function (done) {
     var csvFile = __dirname + "/data/dataWithUnclosedQuotes";
     var conv = new Converter({