Update change log and spec for wrt-plugins-tizen_0.2.82

Update change log and spec for wrt-plugins-tizen_0.2.82

Changed Modules : Calendar and TimeUtil

[Version] 0.2.82
[Project] GT-I8800, Public
[Title] SEL Verification
[Team] WebAPI
[BinType] PDA
[Customer] Open

[Issue#] S1-8507
[Problem] Calendar - Crash while converting recurrent event to web event
[Cause] missing null check before strtok
[Solution] Add null check

[Issue#] N_SE-9207
[Problem] TimeUtil - addDuration(new tizen.TimeDuration(2222222222, DAYS)) result has minus value.
[Cause] The type of TimeDuration's length is long long. But the parameter type of add in ICU is int32. So type conversion problem occurs.
[Solution] If TimeDuration's length is over int32's max/min value, it will be added first within the limits of the possible and the rest will be added next. And If result is over max/min value that can be handled in ICU, it will raise an UNKNOWN Exception.

[SCMRequest] N/A

Change-Id: I47418cd43b86a724b034afbfa1d3b1322179aac5