Merge pull request #228 from ricardotk/wip-notification

[Notification] Add support for led, sound and vibration
Bump version to 0.20
Bump version to 0.21
Bump version to 0.22
[Notification] Fix GetULongFromJSONValue

Now if GetULongFromJSONValue parameter isn't unsigned long, the default
value is set (0).
[Notification] Add support for number and add GetLongFromJSONValue
[DO NOT MERGE] Add support for detail info