[fix] remove references to write-stream

Author: jcrugzz

lib/levelup.js

@@ -18,7 +18,6 @@ var EventEmitter   = require('events').EventEmitter
   , InitializationError = require('./errors').InitializationError
 
   , ReadStream     = require('./read-stream')
-  , WriteStream    = require('./write-stream')
   , util           = require('./util')
   , Batch          = require('./batch')
   , codec          = require('./codec')
@@ -439,12 +438,6 @@ LevelUP.prototype.createValueStream = function (options) {
   return this.createReadStream(extend(options, { keys: false, values: true }))
 }
 
-LevelUP.prototype.writeStream =
-LevelUP.prototype.createWriteStream = function (options) {
-  //XXX is extend needed here?
-  return new WriteStream(extend(options), this)
-}
-
 LevelUP.prototype.toString = function () {
   return 'LevelUP'
 }