[webapi][XWALK-3190] Update touch tests from w3c

- Update latest tests from w3c
- Reomve touchevent/TouchList_attributes_exist.html and touchevent/Touch_attributes_exist.html, since w3c/single-touch-manual.html contain these check point

Impacted tests(approved): new 0, update 41, delete 0
Unit test platform: [android] crosswalk-10.38.222
Unit test result summary: pass 41, fail 0, block 0
[webapi][XWALK-3191] Update mediastream tests from w3c

- Update the latest w3c cases about media

Impacted tests(approved): new 0, update 21, delete 0
Unit test platform: [IVI] crosswalk-10.39.233, t-e-c 0.120
Unit test result summary: pass 5, fail 16, block 0
[webapi][XWALK-3056] Update align-self initial value for flexiblebox

- Update align-self initial value to auto following spec defined

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [IVI] crosswalk-10.39.233, t-e-c 0.120
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #1544 from xinliux/webapi/touch/XWALK-3190

[webapi][XWALK-3190] Update touch tests from w3c
Merge pull request #1545 from xinliux/webapi/gumallow/XWALK-3191

[webapi][XWALK-3191] Update mediastream tests from w3c
Merge pull request #1548 from xinliux/flexiblebox/XWALK-3056

[webapi][XWALK-3056] Update align-self initial value for flexiblebox