Replace Placeholders in any JSON
Member mode allow to replace object member
without using the {{}} of left part of the variables
@param json {Object}
@param variables {Object}
@param memberMode {Boolean}
@param callback {Function}
function (json, variables, memberMode, callback) {
		if (typeof memberMode == 'function') {
			callback = memberMode;
			var member_mode = memberMode || false;
		} else {
			var member_mode = memberMode || false;
		}
			
		var str = JSON.stringify(json);
		var output = str.replace(/{{\w+}}/g, function(found) {
			found = (member_mode) ? found.match(/[\w\.]+/)[0] : found;
			
			// Traverse object
			var f;
			traverse(variables).forEach(function (v) {
				if (v && typeof v[found] != 'undefined') {
					if (typeof v[found] != 'string') {
						// Stringify if not string yet
						f = JSON.stringify(v[found]);
					} else {
						f = v[found] || found;
					}
				}
			});
			return f;
		});
		
		// Array must have the first and last " stripped
		// otherwise the JSON object won't be valid on parse
		output = output.replace(/"\[(.*)\]"/, '[$1]');
	
		callback(JSON.parse(output));
	}