Update deps without licenses

The following packes did not have discernible LICENSE files at the hash we have
vendored:
  github.com/beorn7/perks
  github.com/daviddengcn/go-colortext
  github.com/garyburd/redigo
  github.com/prometheus/common
  github.com/shurcooL/sanitized_anchor_name
  github.com/stretchr/objx

This commit updates all of them and updates the central LICENSE file.

vendor/github.com/stretchr/objx/LICENSE.md

@@ -0,0 +1,23 @@
+objx - by Mat Ryer and Tyler Bunnell
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Stretchr, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/stretchr/objx/value.go

@@ -1,5 +1,10 @@
 package objx
 
+import (
+	"fmt"
+	"strconv"
+)
+
 // Value provides methods for extracting interface{} data in various
 // types.
 type Value struct {
@@ -11,3 +16,41 @@ type Value struct {
 func (v *Value) Data() interface{} {
 	return v.data
 }
+
+// String returns the value always as a string
+func (v *Value) String() string {
+	switch {
+	case v.IsStr():
+		return v.Str()
+	case v.IsBool():
+		return strconv.FormatBool(v.Bool())
+	case v.IsFloat32():
+		return strconv.FormatFloat(float64(v.Float32()), 'f', -1, 32)
+	case v.IsFloat64():
+		return strconv.FormatFloat(v.Float64(), 'f', -1, 64)
+	case v.IsInt():
+		return strconv.FormatInt(int64(v.Int()), 10)
+	case v.IsInt():
+		return strconv.FormatInt(int64(v.Int()), 10)
+	case v.IsInt8():
+		return strconv.FormatInt(int64(v.Int8()), 10)
+	case v.IsInt16():
+		return strconv.FormatInt(int64(v.Int16()), 10)
+	case v.IsInt32():
+		return strconv.FormatInt(int64(v.Int32()), 10)
+	case v.IsInt64():
+		return strconv.FormatInt(v.Int64(), 10)
+	case v.IsUint():
+		return strconv.FormatUint(uint64(v.Uint()), 10)
+	case v.IsUint8():
+		return strconv.FormatUint(uint64(v.Uint8()), 10)
+	case v.IsUint16():
+		return strconv.FormatUint(uint64(v.Uint16()), 10)
+	case v.IsUint32():
+		return strconv.FormatUint(uint64(v.Uint32()), 10)
+	case v.IsUint64():
+		return strconv.FormatUint(v.Uint64(), 10)
+	}
+
+	return fmt.Sprintf("%#v", v.Data())
+}