fix some bugs and new api added

new api added
func (q *FileQueue) PeekAll() ([][]byte, []int64, error) {
func (q *FileQueue) PeekPagination(page, pagesize uint64) ([][]byte, []int64, error) {
// Status get status info from current queue
func (q *FileQueue) Status() *QueueFilesStatus {

Add fanout queue supports

features pls visit at https://github.com/jhunters/bigqueue/projects/2

fix some bugs and add queue api docs

More api usage, pls visit : https://github.com/jhunters/bigqueue/blob/master/docs/QueueTutorial.md

Fix to correct to work under golang 1.2 and lower compiler

v1.0.1

update doc