Update change log and spec for wrt-plugins-tizen_0.4.61

Update change log and spec for wrt-plugins-tizen_0.4.61

[model] REDWOOD
[binary_type] PDA
[customer] OPEN

[Issue] N/A
[Problem] Intensive TC fail
[Cause] When constructing NDEFMessage ,NDEFRecord, NDEFRecordText, NDEFRecordURI or NDEFRecordMedia, it checks if arguments are valid or not. And if they are not valid, it sends an exception.
[Solution] It will not send exception in the cases. It will use default values instead of invalid arguments when setting attributes or constructing them with invalid ones or send exceptions when calling APIs that use them.

[Issue#] Docomo QA 3
[Problem] Even if User-Agent changed, it is not applied to download API
[Cause] Download API requires Header setting
[Solution] Set User-Agent to download API

[Issue] N/A
[Problem] TCT Fail
[Cause] It doesn't raise exception if the type of listener's argument is undefined. And if it doesn't have any valid argument, it raises exception.
[Solution] It will check arguments's types using ArgumentValidator.

[Issue] N/A
[Problem] can assign null value to title.
[Cause] don't use StaticValue.
[Solution] using StaticValue.

[Issue#] N/A
[Problem] getAppContext fails not on independent WebApp
[Cause] This function have got appID from platform API
[Solution] API must get appID from WRT

[Issue#] P130815-05559
[Problem] "undefined" value is returned when rrule is set to null.
[Cause] No clear spec description.
[Solution] Return null when rrule is set to null.

[team] WebAPI
[request] N/A
[horizontal_expansion] N/A

UnitTC passed.