[misc] Beautify xwalk-system-tests

- Move js/thirdparty/ to js/jquery/
- Lowercase all sub-directories
[misc] Comment out the test cases based on Blink test framework

- These tests should be uncommented when the Blink test framework works
[misc] Fixup issue of lowercase sub-directories

- Seems the 'id' is used to find the test file
[misc] Reorder the properties of Tizen Runtime extensions
Merge pull request #671 from zqzhang/zqzhang/xwalk-system-beautify

[misc] Beautify xwalk-system-tests