added tests for bug #9
Added missing tests for #9

Some tests which should've been merged a long time ago...
Merge remote-tracking branch 'remotes/origin/issues/9-zero-validation-fail'
Implemented tests for StreamSocketClient::close() - Fixes #26
Added stream-context support to StreamSocketClient (#24)
Added tests for stream-context on StreamSocketClient (#24)
Skip HHVM failures and add documentation to README