A quick fix to vroom.js replaceFirst and replaceAll functions

Replace the functions VroomUtils.replaceFirst(...) and VroomUtils.replaceAll(...) with following to improve the performance:

VroomUtils.replaceFirst = function (text, s, t) {    
    if (text !== null && text.indexOf(s) !== -1) {
        text = text.replace(s, t);
    }
    return text;
};

VroomUtils.replaceAll = function (text, s, t) {
    if (text !== null) {
        while(text.indexOf(s) !== -1) {
            text = text.replace(s, t);
        }
    }
    return text;
};