Heavy packaging refactoring

. Rename and reset features/update-site
. Create a dedicated target-platform based on Kepler platform
Delete an old Acceleo2 based service.
[build] Migrate to Sirius
[build] Fix build warning
Fix Acceleo expression for Sirius migration
Use Sirius 1.0.0
Fix acceleo expressions in IBD
Fix acceleo expressions in Parametric diagram
Fix requirements in BDD
[build] Use only one target-platform for this git repo
[build] Re-add paperclips in the target-platform

@see https://bugs.eclipse.org/bugs/show_bug.cgi?id=422587
Use Sirius 1.0.0 M4
Add tests project to SysML Designer
Fix Acceleo 2 expressions
Use specific interpreter service for getting inverse refs
Remove dependency to viewpoint test api as it was not released for Sirius 1.0.0 M4
Fix #14 navigation tools to create activity and statemachine from a block
Fix #22 add composition tool in requirement diagram
Update target platform to remove dependency to viewpoint test api
Works on #74 : Use the sirius nightly to prepare 1.0.0 M5