Added support for Hadoop Sequence Files.
Added support for Hadoop Sequence Files.

- Changed recommended code by johnynek, where he suggests using the
  Manifest to overcome type erasure issues.

tglstory/scalding,cauchycui/scalding,nvoron23/scalding,sid-kap/scalding,avp1984/scalding,zirpins/scalding,JiJiTang/scalding,cchepelov/scalding,MansurAshraf/scalding,MansurAshraf/scalding,nvoron23/scalding,AaroC357/scalding,AaroC357/scalding,f7753/scalding,lucamilanesio/scalding,chrismoulton/scalding,aposwolsky/scalding,twitter/scalding,zirpins/scalding,sriramkrishnan/scalding,cchepelov/scalding,vidyar/twitterscalding,avp1984/scalding,stripe/scalding,danosipov/scalding,twitter/scalding,rjhall/etsy.scalding,vidyar/twitterscalding,oeddyo/scalding,piyushnarang/scalding,lucamilanesio/scalding,benpence/scalding,tdyas/scalding,rjhall/etsy.scalding,nkhuyu/scalding,tresata/scalding,wanyifu/scaldingtest,soundcloud/scalding,benpence/scalding,sid-kap/scalding,sriramkrishnan/scalding,tglstory/scalding,tdyas/scalding,wanyifu/scaldingtest,benpence/scalding,wanyifu/scaldingtest,soundcloud/scalding,danosipov/scalding,sunilrebel/scalding,piyushnarang/scalding,stripe/scalding,bendridi/scalding,oeddyo/scalding,sunilrebel/scalding,tglstory/scalding,twitter/scalding,sriramkrishnan/scalding,rubanm/scalding,sid-kap/scalding,jzmq/scalding,aposwolsky/scalding,sunilrebel/scalding,JiJiTang/scalding,bendridi/scalding,avp1984/scalding,bendridi/scalding,soundcloud/scalding,cchepelov/scalding,rubanm/scalding,bmyerz/scalding,f7753/scalding,MansurAshraf/scalding,nkhuyu/scalding,epishkin/scalding,bmyerz/scalding,aposwolsky/scalding,piyushnarang/scalding,epishkin/scalding,Chasego/scalding,f7753/scalding,tresata/scalding,JiJiTang/scalding,bmyerz/scalding,cauchycui/scalding,nkhuyu/scalding,chrismoulton/scalding,cauchycui/scalding,AaroC357/scalding,jzmq/scalding,lucamilanesio/scalding,oeddyo/scalding,Chasego/scalding,chrismoulton/scalding,jzmq/scalding,rubanm/scalding,tresata/scalding,Chasego/scalding,nvoron23/scalding,danosipov/scalding,tdyas/scalding,zirpins/scalding