Fix folder renaming and moving

[RyanMcG]

Currently it's broken. For example:

RENAME the following files:

        ./fo/bar → ./foo/baz

Would you like to make the changes described above (y/n)? y                                                                                                                                                                                   
thread 'main' panicked at 'failed to change', src/libcore/option.rs:785                                                                                                                                                                       
stack backtrace:                                                                                                                                                                                                                              
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace                                                                                                                                                                                
   1: std::sys_common::backtrace::_print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: std::panicking::rust_panic_with_hook
   5: std::panicking::begin_panic
   6: std::panicking::begin_panic_fmt
   7: rust_begin_unwind
   8: core::panicking::panic_fmt
   9: core::option::expect_failed
  10: edfp::main
  11: std::panicking::try::do_call
  12: __rust_maybe_catch_panic
  13: std::rt::lang_start
  14: __libc_start_main
  15: _start