[Time] Fix TimeDuration unit set property comparison
[Time] Fix toString getDay misunderstanding

getDay() returns the day of the week (0 - 6)
getDate() returns the day of the month (1 - 31)
[Time] Add unicode timezone support

Tizen uses unicode timezone to do timezone operations.
Merge pull request #176 from ricardotk/wip

[Time] Add unicode timezone support and fix API