New AJAX transition from parent issue to sub-task

Current behaviour:

When you click in a subtask in the parent issue subtask list, the subtask content loads via AJAX and although the browser navigation is updated there are some problems that occur due to this new feature:

• The "back" button doesn't go to the parent issue anymore;
• If you delete the subtask, you are redirected to the Issues screen and lose track of the parent card you were;

Previous behaviour:

Before, when you are seeing any standarIssueType, and clicked to any of its subtasks, there was a browser redirection to the new subtask.

Suggested approach:

The context should be updated so the "back" browser button would work as expected.
The same should occur with a sub-task deletion.