Progress in adapting edit window to new API.

Improve building system with better sources and javadoc attachement, upload site to GitHub pages instead of Nexus and preparation for Travis integration

Fix issues on visualization engine, updating to the latest JOGL version #1098 and fix HiDPI problems #961

#835 Error and file deletion when importing non-gzipped .gexf files (0.8.2-beta, Linux)
#918 Cannot open graph files in /tmp
#757 WTF: Gephi deletes my GML file

Import GraphML files correctly (Issue #147)

Fix links in set_transifex.py

Update links in add_language.py

Update links in set_transifex.py

Update links in po2properties.sh

Implement #1105. Replace current WorkspaceUI module by new implementation in DesktopPerspective, which has been renamed to DesktopBanner.

Replace ChangeListener by PropertyChangeListener in ProjectInformation and WorkspaceInformation. Also improve documentation in ProjectAPI.