Merge branch 'dev-1.2.6' of http://github.com/campaign/ueditor into dev-1.2.6

Conflicts:
	_test/plugins/basestyle.js
	_test/plugins/link.js
[case]
[case]
[case]
[case]
[case]
[case]
[test]
by zhanyi
by zhanyi
Merge remote-tracking branch 'origin/dev-1.2.6' into dev-1.2.6
by zhanyi
by zhanyi
by zhanyi
[fadd]
[fixed] by xuheng
     table居中方式
取消表头上的颜色变更选项
Merge branch 'dev-1.2.6' of github.com:campaign/ueditor into dev-1.2.6
[add]       知道分支
Merge remote-tracking branch 'origin/dev-1.2.6' into dev-1.2.6