Merge branch 'ruby18-errors' into 'master'

Ruby18 errors

Fixes some errors on CentOS 6.

```
$ byteback-prune
/usr/bin/byteback-receive:120: undefined method `+' for nil:NilClass (NoMethodError)
	from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `inject'
	from /usr/bin/byteback-receive:119:in `each'
	from /usr/bin/byteback-receive:119:in `inject'
	from /usr/bin/byteback-receive:119


# byteback-backup
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': /usr/share/byteback/byteback/backup_directory.rb:154: syntax error, unexpected '.', expecting kEND (SyntaxError)
          .compact
           ^
/usr/share/byteback/byteback/backup_directory.rb:194: syntax error, unexpected '.', expecting kEND
        .compact
         ^
	from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /usr/share/byteback/byteback.rb:3
	from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /usr/bin/byteback-receive:11
```


See merge request !1

1 files changed, 2 insertions, 4 deletions

diff --git a/lib/byteback/backup_directory.rb b/lib/byteback/backup_directory.rb
index 14a55cf..89b0ae9 100644
--- a/lib/byteback/backup_directory.rb
+++ b/lib/byteback/backup_directory.rb
@@ -150,8 +150,7 @@ module Byteback
           next if entry[0] == '.'
           name = File.expand_path(ENV['HOME'] + '/' + entry)
           File.directory?(name + '/current') ? BackupDirectory.new(name) : nil
-        end
-          .compact
+        end.compact
       end
 
       # Returns every snapshot in every backup directory
@@ -190,8 +189,7 @@ module Byteback
           # directory name must represent a parseable Time
           nil
         end
-      end
-        .compact
+      end.compact
     end
 
     # Create a new snapshot of 'current'