ensure we can install from third-party repos across playbooks

roles/common/tasks/main.yml

     - apticron
     - update-notifier-common
     - debian-goodies
+    - apt-transport-https
+    - python-software-properties
 
 - name: Install ntp
   apt: pkg=ntp state=installed

roles/owncloud/tasks/owncloud.yml

 - name: Create database for ownCloud
   mysql_db: name={{ owncloud_mysql_database }} state=present
 
-- name: Install ownCloud dependencies
-  apt: pkg=python-software-properties
-
 - name: Ensure repository key for ownCloud is in place
   apt_key: url=http://download.opensuse.org/repositories/isv:ownCloud:community/Debian_7.0/Release.key state=present
 
 - name: Enable Apache rewrite module
   command: a2enmod rewrite creates=/etc/apache2/mods-enabled/rewrite.load
   notify: restart apache
-  
+
 - name: Enable Apache headers module
   command: a2enmod headers creates=/etc/apache2/mods-enabled/headers.load
   notify: restart apache