Add toBeGreatThanOrEqual and toBeLessThanOrEqual matchers

- Implements issue #1013

src/core/matchers/toBeGreaterThanOrEqual.js

@@ -0,0 +1,14 @@
+getJasmineRequireObj().toBeGreaterThanOrEqual = function() {
+
+  function toBeGreaterThanOrEqual() {
+    return {
+      compare: function(actual, expected) {
+        return {
+          pass: actual >= expected
+        };
+      }
+    };
+  }
+
+  return toBeGreaterThanOrEqual;
+};