The "FindElements" calls fail to correctly initialise the returned Elements

[stp-ekioh]

The "FindElements" functions in element.go, session.go, and shadowroot.go do not work as expected as the for loops are modifying copies of the elements rather than those in the array. In each case changing the for loops from:

	for _, element := range elements {
		element.SessionID = e.SessionID
		element.client = e.client

to:

	for index, _ := range elements {
		elements[index].SessionID = e.SessionID
		elements[index].client = e.client

appears to fix the issue.

[stp-ekioh]

See #3 for a potential fix...