Update p5-File-Remove to 1.50.

Changes from previous:
1.50 Mon 11 Jul 2011 - Adam Kennedy
        - Adding a second skip for the known-bad cygwin file permissions problem

1.49 Wed 14 Mar 2011 - Adam Kennedy
        - Restoring 02_directoreis to no_plan as it runs different test counts
          on different systems.

1.48 Fri 11 Mar 2011 - Adam Kennedy
        - Promoting dev code to production version
        - Fixed a major bug in the 1.46 logic that works out what to change the
          cwd to when deleting while inside a directory.

1.47_01 Fri 18 Feb 2011 - Adam Kennedy
        - Add test counts to all test scripts
        - Added a test for space-safe globs

1.46 Fri 18 Feb 2011 - Adam Kennedy
        - No changes from 1.45_01
        - CPAN Testers likes the dev release, moving to production release

1.45_01 Thu 17 Feb 2011 - Adam Kennedy
        - Updated to Module::Install::DSL 1.00
        - Skip test on cygwin due to non-root users not being able to deny
          themselves write permissions to files.
        - Added a test to delete directories when the current working
          directory is inside the location to delete (ADAMK)
        - Fixes for trash() with callbacks and on Mac (MIYAGAWA)

(hiramatsu)