[#42] add show view

app/views/api/v1/issues/show.json.jbuilder

@@ -0,0 +1,11 @@
+json.issue do |json|
+  json.partial! 'issue', :issue => @issue, :json => json
+  json.issue @issue.body
+  json.partial! 'api/v1/shared/owner', :owner => @issue.user
+  json.closed_at @issue.closed_at.to_i
+  json.closed_by do |json_user|
+    json.partial! 'api/v1/shared/member', :member => @issue.closer, :tag => json_user
+  end if @issue.closer
+  json.created_at @issue.created_at.to_i
+  json.updated_at @issue.updated_at.to_i
+end