[webapi] Integrate 11 tests for W3C Selectors Level 2

Impacted tests(approved): new 11, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 11, fail 0, block 0
Merge pull request #1151 from xinliux/selectors2-integrate

[webapi] Integrate 11 tests for W3C Selectors Level 2