Changed required execution environment to Java 7

Change-Id: I7bffe4d35a612617c42a60dc693a3713cb0458eb
Updated vendor information.

Change-Id: Ic92207401ab951057d2fd7796274c8f8b8df707d
Open editor for loaded models.

Change-Id: I1b927109d4e882c877854d9b576909e0bea5f36f
Move static methods from URIImpl to URIs.

Change-Id: I910f4d17c46607cbaca0ec66b230d0bd00a3644a
Add helper class for project-based sharing of model sets between multiple editors.

Change-Id: I5a3773cbc3609e070f07a21d785df995ba27ae40
Restructured popup menus. Added refactor support.

Changed menu structure to include rdf-tools submenu w/ separator.
Moved Load Model into rdf-tools submenu.
Added new refactor submenu to rdf-tools submenu.

Change-Id: I55d81e127f64ae4fdb3d0fc4acb4726777319864