strings.xml: add new strings and rename old ones
Add views for new informations in author layout
Use new IDs and string IDs for organization views
Use new string IDs for the work layout
Add JSON helper functions
Add a POJO representing an author

It offers easy access to the data of the JSONObject provided to the
constructor.
Author: refactor the code using the Author class
Author: show default image when no image provided
Add WorkAdapter to display works list of an author
ViewAuthorActivity: use WorkAdapter
Author: separate editorial notes with blank line
Add a POJO representing a work

It offers easy access to the data of the JSONObject provided to the
constructor.
Work: no more use of ListView -> using ScrollView
Work: add views and strings for new informations
Work: refactor the code using the Work class
Author: fix the intent that load the selected work
JsonHelper: returns an empty Work array, not null