Added tests for reactions when overwriting.
Added a check when moving or copying deleted files.
Removed url resolving from RCIO provided urls in the tests. RCIO items should always return resolved urls.
Consolidating RCIOFile to never have trailing slashes in urls, RCIODirectory to always have trailing slashes in urls.
Added tests for NSURL+TrailingSlash.
Added tests for NSURL+TrailingSlash to account for NSURL magic.
Reimplemented NSURL+TrailingSlash to account for NSURL magic.
Changed how itemCache keys are canonicalized from URLByResolvingSymlinksInPath to URLByDeletingTrailingSlash.