Use instance path instead of instance name, to make variable names
unique.
Merge with the master
Merge remote-tracking branch 'upstream/master'
Merge pull request #55 from gibello/master

Fixed variables naming in exports
Improve the writer for Roboconf DSL
Removed imports when undeploying, to prevent old imports from being
re-sent at next deploy/start.
Add unit tests
Merge pull request #58 from gibello/master

Removed imports when undeploying, to prevent old imports from being
Merge remote-tracking branch 'origin/master'
New unit tests
+ Better validation for the runtime model
+ New methods for the runtime model (chain approach)
Complete unit tests in the core and fix a regression
Merge pull request #60 from vincent-zurczak/master

Complete the Model Management
Merge remote-tracking branch 'upstream/master'