Merge pull request #296 from zivchang/next

[bug fixing] TDIS-5887
[bug fixes] TDIS-5655 [API][Notification] The value is incompatible with expected
Merge pull request #297 from zhizhangchen/fix-TDIS-5655

[bug fixes] TDIS-5655 [API][Notification] The value is incompatible with...
[bug fixing] TDIS-5655

assign id when calling tizen.notification.post()