Fixes #436 Deleting Java package causes exception during refactoring

Created originally on Bitbucket by colin-hurley (Colin Hurley)

Was already merged in Bitbucket before import, marked as merged by the import user

Removing resources no longer relies on Mercurial removing files/directories from the disk. Instead, Mercurial now only records the removal in the commit status (like executing hg forget) and the actual file deletion is instead delegated to Eclipse. Since Mercurial no longer removes the files itself, it also no longer removes empty Java package directories. As a result, Eclipse will no longer throw an exception when it tries to remove the directory, because Mercurial will not have already deleted it.