Minor cleanup on interleaved FASTQ input format. 

Added explicit dependency on hadoop-mapreduce which is necessary for running downstream. If this dependency isn't added, the hadoop-mapreduce package can take a different version from the hadoop-core package, which can lead to class change exceptions:

```
Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
	at org.bdgenomics.adam.io.InterleavedFastqInputFormat.isSplitable(InterleavedFastqInputFormat.java:337)
	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:352)
	at org.apache.spark.rdd.NewHadoopRDD.getPartitions(NewHadoopRDD.scala:90)
```