Possibility to open a new issue form after viewing another one.

While looking at an issue you no longer need to go back to the issue list for creating the next one.

app/views/issues/show.html.haml

@@ -6,6 +6,10 @@
     = @issue.created_at.stamp("Aug 21, 2011")
   %span.right
+    - if can? current_user, :write_issue, @project
+      = link_to new_project_issue_path(@project, issue: { assignee_id: params[:assignee_id], milestone_id: params[:milestone_id]}), class: "btn grouped" do
+        %i.icon-plus
+        New Issue
     - if can?(current_user, :admin_project, @project) || @issue.author == current_user
       - if @issue.closed
         = link_to 'Reopen', project_issue_path(@project, @issue, issue: {closed: false }, status_only: true), method: :put,  class: "btn grouped reopen_issue"