Revert "Adding *.mapreduce I/O Formats for Pail"

Since we're no longer writing Java MR code I don't think we need mapreduce.* support for Pail anymore. That's just additional code to carry it along.

This reverts commit 04599f8fe6f671b69129e111d6c2321a68266daa.

Conflicts:
	dfs-datastores/src/main/java/com/backtype/hadoop/mapreduce/PailMapper.java
	dfs-datastores/src/main/java/com/backtype/hadoop/mapreduce/io/PailInputFormat.java
Moving the PailRecordInfo out of mapreduce package
Bumping the version to 1.4.2-indix