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/garyburd/redigo/redis/pool.go

@@ -94,7 +94,10 @@ var (
 type Pool struct {
 
 	// Dial is an application supplied function for creating and configuring a
-	// connection
+	// connection.
+	//
+	// The connection returned from Dial must not be in a special state
+	// (subscribed to pubsub channel, transaction started, ...).
 	Dial func() (Conn, error)
 
 	// TestOnBorrow is an optional application supplied function for checking
@@ -116,7 +119,7 @@ type Pool struct {
 	// the timeout to a value less than the server's timeout.
 	IdleTimeout time.Duration
 
-	// If Wait is true and the pool is at the MaxIdle limit, then Get() waits
+	// If Wait is true and the pool is at the MaxActive limit, then Get() waits
 	// for a connection to be returned to the pool before returning.
 	Wait bool
 
@@ -135,8 +138,9 @@ type idleConn struct {
 	t time.Time
 }
 
-// NewPool creates a new pool. This function is deprecated. Applications should
-// initialize the Pool fields directly as shown in example.
+// NewPool creates a new pool.
+//
+// Deprecated: Initialize the Pool directory as shown in the example.
 func NewPool(newFn func() (Conn, error), maxIdle int) *Pool {
 	return &Pool{Dial: newFn, MaxIdle: maxIdle}
 }