Optional $expected in putAttributes()

[Jordan Snodgrass]

Another issue with 0.7.0:

The $expected param in putAttributes() and deleteAttributes() should be optional.  Otherwise you get a warning:

Warning: Missing argument 4 for SimpleDB::putAttributes()

To fix,

public function putAttributes($domain, $item, $attributes, $expected) {

public function deleteAttributes($domain, $item, $attributes = null, $expected) {

Should be:

public function putAttributes($domain, $item, $attributes, $expected = null) {

public function deleteAttributes($domain, $item, $attributes = null, $expected = null) {

[Dan Myers]

Updated in subversion :)