Revert "intermediate checkin"

This reverts commit 82d6cb153180142540413ab624f20f5cd2a596a7.
add support for element as return and value type
site content
minor refactoring
Adding support of Callable and Supplier as parameters or collection
values.
Fix java8 integration for Supplier
fix upper bound wildcards
Update README.md
intermediate checkin
version update
Merge branch 'master' of https://github.com/SvenEwald/xmlbeam.git
Added to verify issue18
Added to verify issue19
intermediate checkin
staging to version 1.3
updated release date
preparing release 1.3
next version 1.3.1-SNAPSHOT
Merge branch 'master' into dev1.2.2

Conflicts:
	src/main/java/org/xmlbeam/ProjectionInvocationHandler.java
	src/main/java/org/xmlbeam/util/intern/DOMHelper.java
	src/main/java/org/xmlbeam/util/intern/duplex/WritingXPath.java