Task npa now check if package name is valid.
Refactored npa task, using the same techniques of scaffold task.
Added a default menu layout, and main activity uses that menu.
Test were updated.
Merge pull request #19 from luismfonseca/npa-refactor

Npa refactor
Merge branch 'master' into orm-101
Added sqldroid jar manually as the artifact isn't in any repository I've seen.
DatabaseVersion model automatically created when running npa task.
Updated test projects to test these changes.