migrate on Xtend 2.4.2
Structucal changes:
1. Extract todomvc gwt project into the separate directory: todomvc.
2. Add project for GWT Active Annotations: annotations.
Structucal changes:
1. Extract todomvc gwt project into the separate directory: todomvc.
2. Add project for GWT Active Annotations: annotations.
move README.md to the upper level
Merge pull request #1 from akosyakov/master

migration on Xtend 2.4.2