STUDIO-2501
Use a specific IClasspathContainer instance per repository

Conflicts:
	bundles/plugins/org.bonitasoft.studio.common.repository/src/org/bonitasoft/studio/common/repository/Repository.java
	bundles/plugins/org.bonitasoft.studio.dependencies/src/org/bonitasoft/studio/dependencies/classpath/UserDependenciesClasspathContainer.java