Explicitly expect Exceptions from promises
Add missing (optional) $one_way parameter
Simplify Encoder to only encode() a function call into a Request object
Fix weird memory reference issue in older PHP versions
http://php.net/manual/de/soapclient.dorequest.php#94490
Test 5.4 and 5.5 just to be sure
Merge branch 'patch-1' of github.com:WyriHaximus/php-soap-react into patch-1