[Network] Move error information methods into dedicated trait

Review Request #50 — Created Feb. 10, 2013 and submitted — Latest diff uploaded

pprkut
Lunr
master
lunr
The Curl and the StreamSocketClient class share the code for retrieving error messages and numbers. With Lunr now depending on PHP 5.4 we can externalize that into a trait which is shared by both.
Unit Tests
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