eliminate Plugin/Abstract.php
Fix: UnitTest: now support simpletest 1.1.0

- simpletest 1.0.x is deprecated
Fix: UnitTestCase adjust access modifier
Merge branch 'feature/fixzsh' into release/2.6.0beta4
Fix: Vies/Redirect: fix for redirect url start with /, close #56, thanks @ucchee
restore AppObject for B.C.

This reverts commit 41857bff92937c85427391f5ccc6f037d2f595b0.