Hi,

`new TextFileSource<>(<4mc compressed input>, strings())` fails with the
error:
java.lang.NullPointerException: null
at com.hadoop.compression.fourmc.Lz4Decompressor.reset(
Lz4Decompressor.java:234).

And trying `(Class<? extends FileInputFormat<?, ?>>)
FourMcTextInputFormat.class` in From.formattedFile() as the format class
doesn't work with class cast exception.

So, how can I read the 4mc compressed input file in Crunch?

Thanks.
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