Fixing large string issue

`fread()` returns *up to* the `$length` specified, so this fixes an issue where `$length` bytes aren't present in the stream at the time of reading, leaving stray data for the next read to pick up.

Author: BrianFranklin

src/RedisClient/Connection/StreamConnection.php

@@ -87,7 +87,13 @@ public function readLine() {
      * @return string
      */
     public function read($length) {
-        return fread($this->getResource(), $length);
+        $read = 0;
+        $data = '';
+        while ($read != $length) {
+            $data .= fread($this->getResource(), ($length - $read));
+            $read = strlen($data);
+        }
+        return $data;
     }
 
 }