Merge branch 'eval_test' of https://github.com/take-cheeze/mruby into take-cheeze-eval_test

mrbgems/mruby-eval/test/eval.rb

+assert('Kernel.eval') do
+  assert_equal(10) { Kernel.eval '1 * 10' }
+  assert_equal('aaa') { Kernel.eval "'a' * 3" }
+end
+
+assert('eval') do
+  assert_equal(10) { eval '1 * 10' }
+end

test/assert.rb

@@ -63,10 +63,9 @@ def assert(str = 'Assertion failed', iso = '')
       $asserts.push(assertion_string('Error: ', str, iso, e))
       $kill_test += 1
       t_print('X')
+    end
   end
-  ensure
-    $mrbtest_assert = nil
-  end
+  $mrbtest_assert = nil
   t_print("\n") if $mrbtest_verbose
 end