Add epics list

app/views/shared/issuable/_nav.html.haml

 - type = local_assigns.fetch(:type, :issues)
 - page_context_word = type.to_s.humanize(capitalize: false)
-- issuables = @issues || @merge_requests
+- issuables = @issues || @merge_requests || @epics
 
 %ul.nav-links.issues-state-filters
-  %li{ class: active_when(params[:state] == 'opened') }>
-    = link_to page_filter_path(state: 'opened', label: true), id: 'state-opened', title: "Filter by #{page_context_word} that are currently opened.", data: { state: 'opened' } do
-      #{issuables_state_counter_text(type, :opened)}
+  - if type != :epics
+    %li{ class: active_when(params[:state] == 'opened') }>
+      = link_to page_filter_path(state: 'opened', label: true), id: 'state-opened', title: "Filter by #{page_context_word} that are currently opened.", data: { state: 'opened' } do
+        #{issuables_state_counter_text(type, :opened)}
 
   - if type == :merge_requests
     %li{ class: active_when(params[:state] == 'merged') }>
@@ -15,7 +16,7 @@
     %li{ class: active_when(params[:state] == 'closed') }>
       = link_to page_filter_path(state: 'closed', label: true), id: 'state-closed', title: 'Filter by merge requests that are currently closed and unmerged.', data: { state: 'closed' } do
         #{issuables_state_counter_text(type, :closed)}
-  - else
+  - elsif type != :epics
     %li{ class: active_when(params[:state] == 'closed') }>
       = link_to page_filter_path(state: 'closed', label: true), id: 'state-closed', title: 'Filter by issues that are currently closed.', data: { state: 'closed' } do
         #{issuables_state_counter_text(type, :closed)}

ee/app/views/groups/epics/_epic.html.haml

+%li
+  .issue-box
+    .issue-info-container
+      .issue-main-info
+        .issue-title.title
+          %span.issue-title-text
+            = link_to epic.title, epic_path(epic)
+        .issuable-info
+          %span.issuable-reference
+            -# TODO: Use to_reference
+            = "&#{epic.iid}"
+          %span.issuable-authored.hidden-xs
+            ·
+            opened #{time_ago_with_tooltip(epic.created_at, placement: 'bottom')}
+            by #{link_to_member(@group, epic.author, avatar: false)}

ee/app/views/groups/epics/index.html.haml

 - page_title "Epics"
 
 - if @epics.to_a.any?
-  -# TODO: Add epics list
+  = render 'shared/epics'
 - else
   = render 'shared/empty_states/epics'

ee/app/views/shared/_epics.html.haml

+
+.top-area
+  -# TODO: Auto highlight All state on page load
+  = render 'shared/issuable/nav', type: :epics
+
+.panel.panel-default.panel-small.panel-without-border
+  %ul.content-list.issuable-list
+    = render partial: 'groups/epics/epic', collection: @epics
+
+-# TODO: Test pagination
+= paginate @epics, theme: "gitlab"