Update etcutils.gemspec
Using rb_io_check_initialized rather than Check_Type

    This way FakeFS::File can be used without type errors.
BUGFIX: Duplicated UIDs

   If the GROUPS files is updated first, it's possible that multiple
   users could have been assigned the same UID.
Adding VERSION and bumping gemspec
Initial steps to deprecate #to_s, replaced with #to_entry

  Also creating a transitional release, in preparation for 1.0.0 (feature/classes)
  Updated README, code, and tests to reflect changes
  Version Bump to 0.1.5