Added DomCrawler component.

Author: barbanet

Symfony/Component/DomCrawler/CHANGELOG.md

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+CHANGELOG
+=========
+
+2.5.0
+-----
+
+* [BC BREAK] The default value for checkbox and radio inputs without a value attribute have changed
+  from '1' to 'on' to match the HTML specification.
+* [BC BREAK] The typehints on the `Link`, `Form` and `FormField` classes have been changed from
+  `\DOMNode` to `DOMElement`. Using any other type of `DOMNode` was triggering fatal errors in previous
+  versions. Code extending these classes will need to update the typehints when overwriting these methods.
+
+2.4.0
+-----
+
+ * `Crawler::addXmlContent()` removes the default document namespace again if it's an only namespace.
+ * added support for automatic discovery and explicit registration of document
+   namespaces for `Crawler::filterXPath()` and `Crawler::filter()`
+ * improved content type guessing in `Crawler::addContent()`
+ * [BC BREAK] `Crawler::addXmlContent()` no longer removes the default document
+   namespace
+
+2.3.0
+-----
+
+ * added Crawler::html()
+ * [BC BREAK] Crawler::each() and Crawler::reduce() now return Crawler instances instead of DomElement instances
+ * added schema relative URL support to links
+ * added support for HTML5 'form' attribute
+
+2.2.0
+-----
+
+ * added a way to set raw path to the file in FileFormField - necessary for
+   simulating HTTP requests
+
+2.1.0
+-----
+
+ * added support for the HTTP PATCH method
+ * refactored the Form class internals to support multi-dimensional fields
+   (the public API is backward compatible)
+ * added a way to get parsing errors for Crawler::addHtmlContent() and
+   Crawler::addXmlContent() via libxml functions
+ * added support for submitting a form without a submit button