Add an option to run skipped tests.

lib/src/runner/configuration/load.dart

Index: lib/src/runner/configuration/load.dart
diff --git a/lib/src/runner/configuration/load.dart b/lib/src/runner/configuration/load.dart
index 8ca7c81c69650be75cc8239770f13f66979145a8..4d0fb4844fe29cf9d684308102fedb00430a4f17 100644
--- a/lib/src/runner/configuration/load.dart
+++ b/lib/src/runner/configuration/load.dart
@@ -169,6 +169,7 @@ class _ConfigurationLoader {
     }
 
     var pauseAfterLoad = _getBool("pause_after_load");
+    var runSkipped = _getBool("run_skipped");
 
     var reporter = _getString("reporter");
     if (reporter != null && !allReporters.contains(reporter)) {
@@ -193,6 +194,7 @@ class _ConfigurationLoader {
 
     return new Configuration(
         pauseAfterLoad: pauseAfterLoad,
+        runSkipped: runSkipped,
         reporter: reporter,
         concurrency: concurrency,
         platforms: platforms,