Correct the target handler in MUC Admin UI (which should be IQAdminHandler)

(instead of IQOwnerHandler)
Remove activation.jar - It's bundled since Java6
Ignore .DS_Store files
Merge pull request #45 from SvenBunge/gitignoreMac

Ignore .DS_Store files
Merge pull request #43 from SvenBunge/removeActivationJar

Remove activation.jar - It's bundled since Java6