Information related to author moved from RepoElement to a separate type (allows reuse)
Repo license also moved to separate file
New RepoLibrary component created to annotate libraries with metadata
RepoManager and LibrariesView upadated to (1) fetch library metadata and (2) show libraries' name instead of their path.
Merge pull request #758 from jtorrente/repo-library-metadata

Repo library metadata
Adds LDPI, MDPI, HDPI and XHDPI assets. Fixes GenerateSkinMojo.
Updates to Gdx 1.3.2-SNAPSHOT, fixes resulting conflicts.
New ScreenViewport for the stage. Different assets are loaded depending on the DPI.
New layouts for the UI based on the new ScreenViewport. Removes the necesity of hardcoded padding and constants in most cases.
Removes eAdventure logo from the ProjectsView.
Improves the hit detection for GalleryItems.
ProjectItems now load the initial scene thumbnail.
Clear the context when the Scene selection changes.
RepositoryManager, avoid downloading libraries if we can load them from the local storage.
Don't release the views when changing language.