Add test case for checking modification in guessDelimiter() (#804)

tests/test-cases.js

@@ -2538,7 +2538,15 @@ var CUSTOM_TESTS = [
 			var results = Papa.parse('"A","B","C","D"');
 			callback(results.meta.delimiter);
 		}
-	}
+  },
+  {
+    description: "Should correctly guess default delimiters when other sign is used more often but not right delimiter.",
+    expected: ";",
+    run: function(callback) {
+      var results = Papa.parse('ID;comment;geom\n1;HiThere;POLYGON(2 3, 3 4, 5 6, 4 5, 4 3, 2 3)\n2;HowAreYou;POLYGON(2 3, 3 4, 5 6, 4 5, 4 3, 2 3)\n3;WhatsUp;POLYGON(2 3, 3 4, 5 6, 4 5, 4 3, 2 3)\n4;Sunday;POLYGON(2 3, 3 4, 5 6, 4 5, 4 3, 2 3)');
+      callback(results.meta.delimiter);
+    }
+  }
 ];
 
 describe('Custom Tests', function() {