BUG: Fix pkgrepo.managed, from_source -> install_from_source (consistency)

nginx/ng/install.sls

 {% from 'nginx/ng/map.jinja' import nginx, sls_block with context %}
 
 nginx_install:
-  {% if nginx.from_source %}
+  {% if nginx.install_from_source %}
   ## add source compilation here
   {% else %}
   pkg.installed:
     {{ sls_block(nginx.package.opts) }}
     - name: {{ nginx.lookup.package }}
   {% endif %}
+
+{% if salt['grains.get']('os_family') == 'Debian' %}
+nginx_ppa_repo:
+  pkgrepo:
+    {%- if nginx.install_from_ppa %}
+    - managed
+    {%- else %}
+    - absent
+    {%- endif %}
+    - humanname: nginx-ppa-{{ grains['oscodename'] }}
+    - name: deb http://ppa.launchpad.net/nginx/stable/ubuntu {{ grains['oscodename'] }} main
+    - file: /etc/apt/sources.list.d/nginx-stable-{{ grains['oscodename'] }}.list
+    - dist: {{ grains['oscodename'] }}
+    - keyid: C300EE8C
+    - keyserver: keyserver.ubuntu.com
+    - require_in:
+      - pkg: nginx_install
+    - watch_in:
+      - pkg: nginx_install
+{% endif %}

nginx/ng/map.jinja

             'vhost_use_symlink': False,
         },
     }, default='Debian' ),
-    'from_source': False,
+    'install_from_source': False,
+    'install_from_ppa': False,
     'package': {
         'opts': {},
     },

nginx/ng/service.sls

     - require:
       - sls: nginx.ng.install
     - watch:
-      {% if not nginx.from_source %}
+      {% if not nginx.install_from_source %}
       - pkg: nginx_install
       {% endif %}