Some refactoring of repeated code in I18N
Merge pull request #3 from anserran/i18n

Some refactoring of repeated code in I18N
- Fixing API level in project.properties in android projects.
- BuildConfig and R files added to index for editor-android
Making bin/ and gen/ properly disappear from repo
Merge pull request #4 from jtorrente/master

- Fixing API level in project.properties in android projects.
Merge branch 'master' of github.com:e-ucm/ead into engineobjects
Change binds for bindings.json