Version 1.0 released

Switch to Java 8
Use MDIUtilities 1.2.4
Use MDIFramework 1.2
Use jEditor 1.1
Use docJGenerator 1.4.16
Use Xerces2-J 2.12.0
Use Xalan 2.7.2
Fix some possible exceptions on the document generator plugin
Add an option to just check the well-formedness of an XML file
Only enable DTD to Schema conversion if the selected tab is a DTD
Only enable Schema document generation if the selected tab is a Schema
Add a new Plugin which generates the Schema associated with an XML file
Add unit tests
Add a wiki