[bug fixes] TDIS-5972 The add() method in Calendar interface could not work well
According to the updated spec to add units to storage object.
Added delay for callback to systemsetting apis.
Fixed "When the number of application launching history records exceed 20, the latest(should be oldest one) record will be replaced by the new one."
[bug fix] TDIS-6862 - adjust duration assignment for CalendarTask
[bug fix] TDIS-6518 - make handlers be optional for package module
Merge pull request #275 from zivchang/next

[bug fixing] TDIS-5716
Merge pull request #273 from jacobchen/next

According to the updated spec to add units to storage object.
Merge pull request #264 from zhizhangchen/fix-TDIS-5972

[bug fixes] TDIS-5972 The add() method in Calendar interface could not w...
Merge pull request #276 from DonnaWuDongxia/next1

[bug fix] TDIS-6862 - adjust duration assignment for CalendarTask
Merge pull request #277 from DonnaWuDongxia/fix-package

[bug fix] TDIS-6518 - make handlers be optional for package module
[bug fix] TDIS-6521 - delete the contact related to a removed person
Merge pull request #278 from DonnaWuDongxia/person

[bug fix] TDIS-6521 - delete the contact related to a removed person
[bug fixing] TDIS-5702

add default testing package - "testpack00"