New Module for Artist Servlet stuff

[ExZos]

• created artist-service module for Artist Servlet stuff
• fixed post data stuff in AlbumREST in the album-service module
• removed unecessary dependencies in each module's pom.xml

Note: now POST and PUT methods of AlbumREST take form data (POST data) so:

• here's how to do a POST request for Albums (using Postman):

• and here's how to do a PUT request for Albums (using Postman):

Edit: woops just noticed the screenshots have the wrong HTTP request methods first one should be POST and second one should be PUT