Update change log and spec for wrt-plugins-tizen_0.2.81

Update change log and spec for wrt-plugins-tizen_0.2.81

Changed Modules : Device, Contact

[Version] 0.2.81
[Project] GT-I8800, Public
[Title] SEL Verification
[Team] WebAPI
[BinType] PDA
[Customer] Open

[Issue#] N/A
[Problem] siso open,private target tc index.html file addition.
[Cause] N/A
[Solution] N/A

[Issue#] N/A
[Problem] when call getCapabilites API, occur crash
[Cause] if we get null value, we can't controll it
[Solution] we added exception controll code

[Issue#] N_SE-9755, N_SE-9580
[Problem] Error when launching contact app right after booting
[Cause] contact svc is not initialized yet
[Solution] retry connction for every getAddressBook()

[SCMRequest] N/A

Change-Id: I938ba4e7fcca80d0d817a14f600d06c9986f35ca