Add support to find admin by id

Author: vita

README.md

@@ -92,6 +92,8 @@ intercom.users.submit_bulk_job(create_items: [{user_id: 25, email: "alice@exampl
 
 #### Admins
 ```ruby
+# Find an admin by id
+intercom.admins.find(:id => admin_id)
 # Iterate over all admins
 intercom.admins.all.each {|admin| puts admin.email }
 ```

lib/intercom/service/admin.rb

@@ -1,10 +1,12 @@
 require 'intercom/service/base_service'
 require 'intercom/api_operations/list'
+require 'intercom/api_operations/find'
 
 module Intercom
   module Service
     class Admin < BaseService
       include ApiOperations::List
+      include ApiOperations::Find
 
       def collection_class
         Intercom::Admin

spec/spec_helper.rb

@@ -71,6 +71,15 @@ def test_admin_list
   }
 end
 
+def test_admin
+  {
+    "type" => "admin",
+    "id" => "1234",
+    "name" => "Hoban Washburne",
+    "email" => "[email protected]"
+  }
+end
+
 def test_company
   {
     "type" => "company",

spec/unit/intercom/admin_spec.rb

@@ -13,4 +13,9 @@
     client.expects(:get).with("/admins", {}).returns(test_admin_list)
     client.admins.all.each { |a| }
   end
+
+  it "gets an admin" do
+    client.expects(:get).with("/admins/1234", {}).returns(test_admin)
+    client.admins.find(:id => "1234")
+  end
 end