Initial commit
Added class DOM\Exception - DOM module exception class
Added class DOM\Source\Pointer\XPath - Represents data for DOMXPath object
Added class DOM\Source\XPath - Getting data from DOM objects by XPath
Added class DOM\Iterator\Node - Recursive DOMNode iterator for iteration over DOM objects
Added class DOM\ToArray - For extracting DOM objects to array
Added class DOM\ToDOMNodeList - For extracting DOM objects to DOMNodeList

Added tests: DOM_Source_XPathTest, DOM_ToArrayTest, DOM_ToDOMNodeList
Cosmetic changes
Composer package inititalization
Update README.md

DOM to array examples
Have moved exception to DDU namespace
Added class ARR\ToDOM - Extracts array to DOM object

Added tests: ARR_ToDOMTest
Exception message constants added
ARR\ToDOM options have been added
Update README.md