-added some tests

-improved test runner

tests/vector.d

@@ -0,0 +1,18 @@
+module tests.vector;
+
+import ecs.simple_vector;
+//import ecs.vector;
+
+unittest
+{
+    SimpleVector vector;
+    vector.add(cast(ubyte[])"a");
+    vector.add(cast(ubyte[])"bsdf");
+    assert(vector[0..5] == cast(ubyte[])"absdf");
+    assert(vector[4] == 'f');
+    assert(vector[] == cast(ubyte[])"absdf");
+    assert(vector[$ - 1] == 'f');
+    
+    vector.clear();
+    assert(vector.length == 0);
+}