Issue #81: Pretty-printing XML/HTML is default.

By default, output is now formatted, and there is an option
to disable.

src/QueryPath/DOMQuery.php

@@ -173,6 +173,14 @@ public function __construct($document = NULL, $string = NULL, $options = array()
       $this->setMatches($this->document->documentElement);
     }
 
+    // Globally set the output option.
+    if (isset($this->options['format_output']) && $this->options['format_output'] == FALSE) {
+      $this->document->formatOutput = FALSE;
+    }
+    else {
+      $this->document->formatOutput = TRUE;
+    }
+
     // Do a find if the second param was set.
     if (isset($string) && strlen($string) > 0) {
       $this->find($string);

src/qp.php

@@ -135,6 +135,10 @@
  *  - omit_xml_declaration: Boolean. If this is TRUE, then certain output
  *    methods (like {@link QueryPath::xml()}) will omit the XML declaration
  *    from the beginning of a document.
+ *  - format_output: Boolean. If this is set to TRUE, QueryPath will format
+ *    the HTML or XML output to make it more readible. If this is set to
+ *    FALSE, QueryPath will minimize whitespace to keep the document smaller
+ *    but harder to read.
  *  - replace_entities: Boolean. If this is TRUE, then any of the insertion
  *    functions (before(), append(), etc.) will replace named entities with
  *    their decimal equivalent, and will replace un-escaped ampersands with