func NewLine(text string) *Line {
	return &Line{text, time.Now(), nil}
}
NewLine returns a Line with present time.
package tail
import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"os"
	"strings"
	"sync"
	"time"
	"github.com/hpcloud/tail/ratelimiter"
	"github.com/hpcloud/tail/util"
	"github.com/hpcloud/tail/watch"
	"gopkg.in/tomb.v1"
)
var (
	ErrStop = fmt.Errorf("tail should now stop")
)
type Line struct {
	Text string
	Time time.Time
	Err  error  
}