WebCL Conformance test suite update for review.

    Summary ::

    Add conformance tests for KHR_fp64 extension.
    Add conformance tests for KHR_fp16 extension.
    Refactor all test cases in extension KHR_gl_sharing.
    Add functionality conformance tests for KHR_gl_sharing extension. [Part 1]

    Add testcases for double datatype for setArg using Float64Array
    Route all calls through utilities in extension
    Modifying appendPostJSToHTML across all files in testsuite.
    Display error if browser doesnt support WebCL
    Correcting a mistake in adding all files to 00_test_list.txt

    Contributors :
    SRI-B : Shilpa Shri, Sharath Kamath.
    SRA : Antonio Gomes and Steven Eliuk.