Make new/edit issue forms use containers on the page instead of adding their own

Fixes #1830

app/assets/javascripts/issues.js

-function switchToNewIssue(form){
+function switchToNewIssue(){
   $(".issues_content").hide("fade", { direction: "left" }, 150, function(){
-    $(".issues_content").after(form);
     $('select#issue_assignee_id').chosen();
     $('select#issue_milestone_id').chosen();
     $("#new_issue_dialog").show("fade", { direction: "right" }, 150);
@@ -10,9 +9,8 @@ function switchToNewIssue(form){
   });
 }
 
-function switchToEditIssue(form){
+function switchToEditIssue(){
   $(".issues_content").hide("fade", { direction: "left" }, 150, function(){
-    $(".issues_content").after(form);
     $('select#issue_assignee_id').chosen();
     $('select#issue_milestone_id').chosen();
     $("#edit_issue_dialog").show("fade", { direction: "right" }, 150);
@@ -33,8 +31,8 @@ function switchFromEditIssue(){
 function backToIssues(){
   $("#edit_issue_dialog, #new_issue_dialog").hide("fade", { direction: "right" }, 150, function(){
     $(".issues_content").show("fade", { direction: "left" }, 150, function() { 
-      $("#edit_issue_dialog").remove();
-      $("#new_issue_dialog").remove();
+      $("#edit_issue_dialog").html("");
+      $("#new_issue_dialog").html("");
       $('.add_new').show();
     });
   });

app/views/issues/edit.js.haml

 :plain
-  var edit_issue_dialog = $("<div id='edit_issue_dialog'></div>");
-  edit_issue_dialog.html("#{escape_javascript(render('form'))}");
-  switchToEditIssue(edit_issue_dialog);
+  $("#edit_issue_dialog").html("#{escape_javascript(render('form'))}");
+  switchToEditIssue();
 

app/views/issues/index.html.haml

@@ -58,6 +58,8 @@
     %ul#issues-table.unstyled.issues_table
       = render "issues"
 
+#new_issue_dialog
+#edit_issue_dialog
 
 :javascript
   $(function(){

app/views/issues/new.js.haml

 :plain
-  var new_issue_dialog = $("<div id='new_issue_dialog'></div>");
-  new_issue_dialog.html("#{escape_javascript(render('form'))}");
-  switchToNewIssue(new_issue_dialog);
+  $("#new_issue_dialog").html("#{escape_javascript(render('form'))}");
+  switchToNewIssue();