[webapi][XWALK-2372] Update screen orientation tests to reflect chromium 38 implementation

- Update screen orientation follow latest spec: http://w3c.github.io/screen-orientation/
- Failure reason: lock(), unlock(), type, angle and onchange all attributes of ScreenOrientation are undefined.

Impacted TCs num(approved): New 0, Update 14, Delete 0
Unit test Platform: Tizen IVI
Tizen test result summary: Pass 2, Fail 12, Blocked 0
[sample] Update sreen orientation sample to reflect Chromium 38 implementation

However, the sample fails on my ZTE with canary 9.38.199.0
The layout shall be restored as before.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2372
update README.md
Merge pull request #851 from jennycao/sample

[sample] update README.md
[sample] Improve test description and remove 2 tests

 Impacted test case: New 0, Update 25, Delete 2
 Unit test platform: Android, Window Chrome
 Unit test result: all tests run well
Merge pull request #853 from zqzhang/XWALK-2372

[sample] Update sreen orientation sample to reflect Chromium 38 implemen...
[sample] Fix typo issue
Merge pull request #854 from Honry/Honry/sample-feedback

[sample] Improve test description and remove 2 tests
[xwalkdriver] Update activity name for crosswalk android package rule changed
[sample] Remove pass and fail image
Merge pull request #855 from Honry/Honry/sample-remove-pass-fail-image

[sample] Remove pass and fail image
[XWALK-2489] Remove the filesupport.js
Remove sample/

These samples are at
https://github.com/crosswalk-project/demo-express

Close #858
Merge pull request #859 from yunxiaoxie/yunxiaoxie/filereader_constructor_base

[XWALK-2489] Remove the filesupport.js
Merge pull request #857 from yunxiaoxie/yunxiaoxie/packRule

[xwalkdriver] Update activity name for crosswalk android package rule changed
Merge pull request #814 from xinliux/xinliux/webapi/XWALK-2372

[webapi][XWALK-2372] Update screen orientation tests to reflect chromium...