Add support for JSON comments

[czechboy0]

JSON comments are a thing apparently. Add support for ignoring them during parsing.

@tannernelson can you please provide specific rules for where and when they can appear?

[tanner0101]

/*
    This is a JSON file multiline comment
*/
{
    "message": "Hello world.", // single line comments work
    "other": "/* don't strip this out */",
    "crazy": "\"/*wow escaped strings are*/ // annoying looking \""
}