Returned jsdoc for info.header, and removed nolonger used opts argument

lib/block.js

@@ -43,6 +43,10 @@ Block._from = function _from(arg) {
     info = Block._fromJSON(arg);
   } else if (_.isObject(arg)) {
     info = {
+      /**
+       * @name Block#header
+       * @type {BlockHeader}
+       */
       header: arg.header,
       /**
        * @name Block#transactions
@@ -105,8 +109,8 @@ Block._fromBufferReader = function _fromBufferReader(br) {
  * @param {BufferReader} - A buffer reader of the block
  * @returns {Block} - An instance of block
  */
-Block.fromBufferReader = function fromBufferReader(br, opts) {
-  var info = Block._fromBufferReader(br, opts);
+Block.fromBufferReader = function fromBufferReader(br) {
+  var info = Block._fromBufferReader(br);
   return new Block(info);
 };
 
@@ -114,8 +118,8 @@ Block.fromBufferReader = function fromBufferReader(br, opts) {
  * @param {Buffer} - A buffer of the block
  * @returns {Block} - An instance of block
  */
-Block.fromBuffer = function fromBuffer(buf, opts) {
-  return Block.fromBufferReader(BufferReader(buf), opts);
+Block.fromBuffer = function fromBuffer(buf) {
+  return Block.fromBufferReader(BufferReader(buf));
 };
 
 /**