Description:
------------
When Solr Server returns an error, the SolrClient throws a SolrClientException with message containing the server raw response.

A new SolrServerException class shall be introduced and thrown on Solr Server based exceptions like when Solr Server throws a SolrParseException if the query was malformatted or contains illegal characters.

Solr Client shall parse and throws the exception code and message, instead of throwing a SolrClientException with the raw response

Test script:
---------------
$options = array
(
		'hostname' => SOLR_SERVER_HOSTNAME,
		'login'    => SOLR_SERVER_USERNAME,
		'password' => SOLR_SERVER_PASSWORD,
		'port'     => SOLR_SERVER_PORT,
		'path'	   => SOLR_SERVER_PATH
);

$client = new SolrClient($options);
$query = new SolrQuery("lucene/");

$response = $client->query($query);


Expected result:
----------------
Fatal error: Uncaught exception 'SolrClientException' with message 'SolrServer 400: 'org.apache.lucene.queryparser.classic.ParseException: Cannot parse 'lucene/': Lexical error at line 1, column 8.  Encountered: <EOF> after : ""'

Actual result:
--------------
Fatal error: Uncaught exception 'SolrClientException' with message 'Unsuccessful query request : Response Code 400. <?xml version="1.0" encoding="UTF-8"?>
<response>

<lst name="responseHeader">
  <int name="status">400</int>
  <int name="QTime">3</int>
  <lst name="params">
    <str name="indent">on</str>
    <str name="wt">xml</str>
    <str name="q">lucene/</str>
    <str name="version">2.2</str>
  </lst>
</lst>
<lst name="error">
  <str name="msg">org.apache.lucene.queryparser.classic.ParseException: Cannot parse 'lucene/': Lexical error at line 1, column 8.  Encountered: &lt;EOF&gt; after : ""</str>
  <int name="code">400</int>
</lst>
</response>