Change how Redis errors such as -ERR replies generates exceptions.

The "throw_errors" connection parameter has been removed and replaced by the
new "exceptions" client option since exceptions on -ERR replies returned by
Redis are not generated by connection classes anymore but are thrown by the
client class and other abstractions such as pipeline contexts.

This change does not affect much people using the Predis\Client class (aside
from the different configuration) but gives much more flexibility to those
building their own pieces of code around the internal classes of Predis.

lib/Predis/ConnectionParameters.php

@@ -28,7 +28,6 @@ class ConnectionParameters implements ConnectionParametersInterface
         'port' => 6379,
         'timeout' => 5.0,
         'iterable_multibulk' => false,
-        'throw_errors' => true,
     );
 
     /**
@@ -71,7 +70,6 @@ class ConnectionParameters implements ConnectionParametersInterface
             'timeout' => $float,
             'read_write_timeout' => $float,
             'iterable_multibulk' => $bool,
-            'throw_errors' => $bool,
         );
     }