Fix #25

- config:default-template now return the directory name where templates
are stored.
- script-directory/@value is now replaced by script-directory/@resource
- stylesheet-directory/@value is now replaced by
stylesheet-directory/@resource
- @resource attribute within config:application will be resolved
- @value attribute within config:application will not be resolved
Fix #24

- Fix custom UI Template
- A unit test is included (see
/src/test/mocha/app-test/templates/model3-name.html.xqy)