ansible: add missing resources

ansible: document why resources are needed

Closes #4977.
Closes #4979.

Signed-off-by: Tim D. Smith <git@tim-smith.us>

Formula/ansible.rb

@@ -30,11 +30,13 @@ class Ansible < Formula
   #   shade (OpenStack)
   #   pywinrm (Windows)
   #   kerberos (Windows)
+  #   xmltodict (Windows)
   #   boto (AWS)
   #   boto3 (AWS)
   #   apache-libcloud (Google GCE)
   #   python-keyczar (Accelerated Mode)
   #   passlib (htpasswd core module)
+  #   zabbix-api (Zabbix extras module)
 
   ### setup_requires dependencies
   resource "pbr" do
@@ -435,6 +437,11 @@ class Ansible < Formula
     sha256 "03fc7cf8d47f910bc64274f7c24808b6ef79a9a1f34be5b94bea7070c9e00e5b"
   end
 
+  resource "pywinrm" do
+    url "https://pypi.python.org/packages/source/p/pywinrm/pywinrm-0.1.1.tar.gz"
+    sha256 "0230d7e574a5375e8a0b46001a2bce2440aba2b866629342be0360859f8d514d"
+  end
+
   resource "rackspace-auth-openstack" do
     url "https://files.pythonhosted.org/packages/3c/14/8932bf613797715bf1fe42b00d413025aac9414cf35bacca091a9191155a/rackspace-auth-openstack-1.3.tar.gz"
     sha256 "c4c069eeb1924ea492c50144d8a4f5f1eb0ece945e0c0d60157cabcadff651cd"
@@ -515,6 +522,16 @@ class Ansible < Formula
     sha256 "4ea17e814e39883c6cf1bb9b0835d316b2f69f0f0882ffe7dad1ede66ba82c73"
   end
 
+  resource "xmltodict" do
+    url "https://pypi.python.org/packages/source/x/xmltodict/xmltodict-0.9.2.tar.gz"
+    sha256 "275d1e68c95cd7e3ee703ddc3ea7278e8281f761680d6bdd637bcd00a5c59901"
+  end
+
+  resource "zabbix-api" do
+    url "https://pypi.python.org/packages/source/z/zabbix-api/zabbix-api-0.4.tar.gz"
+    sha256 "31fab8ca9b12aa5e6fe79b4463cfe62f33ded770ddc933a8d99c4debe934a0de"
+  end
+
   def install
     inreplace "lib/ansible/constants.py" do |s|
       s.gsub! "/usr/share/ansible", pkgshare