Move bin directory to home/local/bin
Unpack script overhaul.

Done some modifications to the unpack script, this includes:

* Removal of the $dotfiles array, this makes the script compatible with
  regular sh instead of requiring bash.
* Simplified the main loop.
* Script announces when unpacking directories to stdout by default.
* Added some more documentation to the script functions.
* dotfiles.log and dotfiles_backups are now created in the $cwd.
Update readme