Fix for Istruncated set to true under certain conditions.

Optimizing List Objects by using binary sort to discard entries in cases
where prefix or marker is set.

Adding test coverage to ListObjects.

Adding benchmark to ListObjects.

pkg/fs/api_suite_test.go

@@ -24,7 +24,6 @@ import (
 	"encoding/xml"
 	"math/rand"
 	"strconv"
-	"time"
 
 	"gopkg.in/check.v1"
 )
@@ -216,7 +215,6 @@ func testPaging(c *check.C, create func() Filesystem) {
 		c.Assert(len(result.Objects), check.Equals, 1)
 		c.Assert(result.Prefixes[0], check.Equals, "this/is/also/")
 	}
-	time.Sleep(time.Second)
 
 	// check delimited results with delimiter without prefix
 	{