Added @Issues annotation support (fixes #360)

* Add new `@Issues(@Issue[])` annotation
* You can mark your test suite/test case with `@Issue` or/and `@Issues` annotations
* Issues from test suite will be added to test case

![2014-09-08 17 51 12](https://cloud.githubusercontent.com/assets/2149631/4186244/3e4c6b10-375f-11e4-8486-66daf35bb966.png)