E_dbus 1.7.3

Changes since E_dbus 1.7.2:
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No changes, just updating to keep in sync with last release.

Changes since E_dbus 1.7.1:
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No changes, just updating to keep in sync with last release.

Changes since E_dbus 1.2.0:
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Improvements:

   * More null checks for API's

Fixes:

   * Properties handling
   * Interface attach to not attach if already there
   * Missing DBus.Properties attach

Changes since E_dbus 1.1.0:
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Fixes:

   * enotify:
    - use of dbus_message_iter_open_container prevent crash on image send.

Improvements:

   * eukit:
    - Correctly handle the dbus type 'object path', it is a string after all.
   * enotify:
    - use eina_log better in enotify-daemon.

Changes since E_dbus 1.0.0:
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Additions:

    * e_notification_action_id_get
    * e_notification_action_name_get
    * e_notification_image_init
    * e_connman: sync api with connman-0.7x

Fixes:

    * DSO linking issues fixed
    * crash on e-notify-send with invalid session bus set
    * when app has no idle time, e_dbus's idlers dont process anything
    * error when trying to add duplicate fd handler for dbus fd

Improvements:

    * notification protocol 1.2 support
    * e_connman supports connman-0.7x api, warns that it is unstable.