Use #map instead of #each and puts.

This will let `irb` do the printing and fix the issue where the entire collections of files and directories were being #inspected after the loops.

*Before:*

```
[4] pry(main)> directories.each do |directory|
[4] pry(main)*   puts directory.key
[4] pry(main)* end  
azurefire
=> [  <Fog::Storage::Rackspace::Directory
    key="azurefire",
    bytes=1264917,
    count=22,
    cdn_cname=nil
  >]
```

*After:*

```
[9] pry(main)> directories.map { |directory| directory.key }
=> ["azurefire"]
```