Merge pull request #24 from martinjones/master

[voicecall] Improvements to ofono plugin.
[voicecall] Warn if default provider is requested and none can be found.
Merge pull request #26 from martinjones/master

[voicecall] Handle starting without a VoiceCallManager interface present...
Merge pull request #28 from martinjones/master

[voicecall] On startup notify clients of ongoing calls.
Merge pull request #25 from rburchell/warn

[voicecall] Warn if default provider is requested and none can be found.
Provide emergency status through telepathy voice call plugin
Fix bunch of unused variable warnings
Merge pull request #30 from jpetrell/warnings

Fix bunch of unused variable warnings
Fix compilation warnings.
Enable ignored errors when handler gets invalidated.
Merge pull request #31 from SamuelNevala/errors

Enable ignored errors when handler gets invalidated.
Merge pull request #29 from jpetrell/master

Provide emergency status through telepathy voice call plugin
[voicecall] Provide emergency status through telepathy voice call plugin

Add missing changelog entry.
[voicecall] Fix incoming ring tone.

Incoming call status is initially null using telepathy plugin. The status
shouldn't be updated when a call is added if the status is null.

Regression due to eb73012e9a54281ac4705367d5c36c7ad46f86b5