add volume and mute subscriptions and set/ get methods
check if duration we get is not zero
When checking for duration not equals 0, also check if media type is not image and media is not paused.
Use UDAP protocol for getMute, setMute and getVolume instead of DLNA
Revert "When checking for duration not equals 0, also check if media type is not image and media is not paused."

This reverts commit 4220d0c5decb69cf5430eae54997a527440c09b5.
Fix getDuration method

When checking for duration not equals 0, also check if media type is not image
Merge pull request #2 from simongladkoskok/netcast_subscriptions

Netcast subscriptions.

Getters and setters for Volume, Mute and Subscriptions were added to Netcast service