Merge pull request #55 from planctechnologies/master

Cloud Inspector widget
Fixes refresh issue in the topology summary dock when a linked node is renamed.
Merge remote-tracking branch 'origin/master'
Add node names to the allocated name list when loading a project.
Lab instructions.
Handle IOS and IOU image changes taking into account servers.
New feature: add a note.
New features: add rectangles & ellipses.
New feature: show/hide interface labels.
New feature: contextual device menu.
New feature: load a project by dropping the project file on the view.
New feature: recent file menu.
New feature: duplicate option for notes, rectangles and ellipses.
Use Dynamips, IOU and VPCS identifiers to correctly load a topology.
Delete key on notes. Fixes #57.
Exception when showing cloud labels. Fixes #60.
IOU: rename startup-config to initial-config because it makes more sense.