[demo-express] Add 3 samples to demo express.

- Fail Reason: XWALK-2401, XWALK-2100

Impacted TCs num(approved): New 3, Update 0, Delete 0
Unit test Platform: [Tizen-IVI]
Unit test result summary: Pass 1, Fail 2, Blocked 0
Merge pull request #12 from JianfengXu/xujf/sample/add

[demo-express] Add 3 samples to demo express.