On loading OrbisGIS, remove old version of bundles
Merge pull request #586 from nicolas-f/fix/bundle-loading

On loading OrbisGIS, remove old version of bundles

Sometimes the OSGi cache contains a bundle(A) with the same artifactId but different version number from a jar(B) in the bundle subdirectory. We manage this situation as follows:

* If version A is newer than B then do not deploy B
* If version A is older than B then uninstall A and deploy B