Without this line, I get the following errors, and I figured that it would be best for the default configuration to provide a complete example that works for the common case.

```
jey@kallisti:~/work/tachyon$ bin/tachyon format
Formatting Tachyon @ localhost
Deleting /home/jey/work/tachyon/libexec/../journal/
Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: 
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:867)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1380)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
        at org.apache.hadoop.fs.Path.getFileSystem(Path.java:187)
        at tachyon.UnderFileSystemHdfs.<init>(UnderFileSystemHdfs.java:69)
        at tachyon.UnderFileSystemHdfs.getClient(UnderFileSystemHdfs.java:52)
        at tachyon.UnderFileSystem.get(UnderFileSystem.java:53)
        at tachyon.Format.main(Format.java:45)
Caused by: java.lang.ClassNotFoundException: 
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:270)
        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:820)
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:865)
        ... 9 more
```