Catch exceptions thrown when decoding (#126)

* Catch exceptions thrown when decoding

Peers with older incompatible hyperdb versions will cause
uncaught exceptions when they connect via the swarm.

* Quick fix -- forgot something

* Another catch

index.js

@@ -768,11 +768,19 @@ Writer.prototype._maybeUpdateFeeds = function () {
 }
 
 Writer.prototype._decode = function (seq, buf, cb) {
-  var val = messages.Entry.decode(buf)
+  try {
+    var val = messages.Entry.decode(buf)
+  } catch (e) {
+    return cb(e)
+  }
   val[util.inspect.custom] = inspect
   val.seq = seq
   val.path = hash(val.key, true)
-  val.value = val.value && this._db._valueEncoding.decode(val.value)
+  try {
+    val.value = val.value && this._db._valueEncoding.decode(val.value)
+  } catch (e) {
+    return cb(e)
+  }
 
   if (this._feedsMessage && this._feedsLoaded === val.inflate) {
     this._maybeUpdateFeeds()
@@ -834,7 +842,12 @@ Writer.prototype._loadFeeds = function (head, buf, cb) {
 
   function onfeeds (err, buf) {
     if (err) return cb(err)
-    done(messages.InflatedEntry.decode(buf))
+    try {
+      var msg = messages.InflatedEntry.decode(buf)
+    } catch (e) {
+      return cb(e)
+    }
+    done(msg)
   }
 
   function done (msg) {