IDE-313 IDE Install should uninstall previous 4.x.x versions

Fixes IDE-313

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #148 from GordonSmith/IDE-313

IDE-313 IDE Install should uninstall previous 4.x.x versions

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>