hbase-6081.  adding section in Compression appendix about changing compression codecs.
hbase-6081.  adding section in Compression appendix about changing compression codecs.

git-svn-id: 949c06ec81f1cb709fd2be51dd530a930344d7b3@1342084 13f79535-47bb-0310-9956-ffa450edef68

amyvmiwei/hbase,HubSpot/hbase,justintung/hbase,Guavus/hbase,SeekerResource/hbase,Apache9/hbase,mapr/hbase,Guavus/hbase,francisliu/hbase,StackVista/hbase,andrewmains12/hbase,Eshcar/hbase,ChinmaySKulkarni/hbase,juwi/hbase,drewpope/hbase,ibmsoe/hbase,joshelser/hbase,HubSpot/hbase,justintung/hbase,amyvmiwei/hbase,Eshcar/hbase,narendragoyal/hbase,narendragoyal/hbase,Guavus/hbase,ultratendency/hbase,JingchengDu/hbase,SeekerResource/hbase,Apache9/hbase,ChinmaySKulkarni/hbase,ibmsoe/hbase,francisliu/hbase,JingchengDu/hbase,toshimasa-nasu/hbase,bijugs/hbase,Guavus/hbase,ChinmaySKulkarni/hbase,vincentpoon/hbase,juwi/hbase,ChinmaySKulkarni/hbase,lshmouse/hbase,bijugs/hbase,Eshcar/hbase,gustavoanatoly/hbase,toshimasa-nasu/hbase,lshmouse/hbase,amyvmiwei/hbase,SeekerResource/hbase,gustavoanatoly/hbase,Eshcar/hbase,andrewmains12/hbase,Eshcar/hbase,narendragoyal/hbase,mahak/hbase,JingchengDu/hbase,drewpope/hbase,HubSpot/hbase,mapr/hbase,vincentpoon/hbase,Guavus/hbase,gustavoanatoly/hbase,mapr/hbase,StackVista/hbase,justintung/hbase,Apache9/hbase,francisliu/hbase,bijugs/hbase,Guavus/hbase,narendragoyal/hbase,HubSpot/hbase,lshmouse/hbase,SeekerResource/hbase,gustavoanatoly/hbase,ultratendency/hbase,vincentpoon/hbase,Apache9/hbase,bijugs/hbase,justintung/hbase,mapr/hbase,StackVista/hbase,Apache9/hbase,JingchengDu/hbase,mapr/hbase,lshmouse/hbase,amyvmiwei/hbase,ultratendency/hbase,francisliu/hbase,Guavus/hbase,StackVista/hbase,narendragoyal/hbase,ultratendency/hbase,bijugs/hbase,ChinmaySKulkarni/hbase,StackVista/hbase,mahak/hbase,ndimiduk/hbase,mahak/hbase,lshmouse/hbase,SeekerResource/hbase,HubSpot/hbase,intel-hadoop/hbase-rhino,mahak/hbase,toshimasa-nasu/hbase,Guavus/hbase,JingchengDu/hbase,joshelser/hbase,gustavoanatoly/hbase,HubSpot/hbase,amyvmiwei/hbase,ndimiduk/hbase,ultratendency/hbase,juwi/hbase,justintung/hbase,andrewmains12/hbase,toshimasa-nasu/hbase,StackVista/hbase,francisliu/hbase,ibmsoe/hbase,francisliu/hbase,intel-hadoop/hbase-rhino,ultratendency/hbase,mahak/hbase,joshelser/hbase,Apache9/hbase,lshmouse/hbase,ibmsoe/hbase,HubSpot/hbase,Eshcar/hbase,Apache9/hbase,SeekerResource/hbase,mahak/hbase,justintung/hbase,gustavoanatoly/hbase,ndimiduk/hbase,justintung/hbase,ibmsoe/hbase,francisliu/hbase,juwi/hbase,StackVista/hbase,vincentpoon/hbase,intel-hadoop/hbase-rhino,bijugs/hbase,intel-hadoop/hbase-rhino,apurtell/hbase,bijugs/hbase,ibmsoe/hbase,juwi/hbase,mahak/hbase,toshimasa-nasu/hbase,mahak/hbase,SeekerResource/hbase,JingchengDu/hbase,ibmsoe/hbase,mapr/hbase,JingchengDu/hbase,juwi/hbase,Eshcar/hbase,lshmouse/hbase,gustavoanatoly/hbase,amyvmiwei/hbase,vincentpoon/hbase,vincentpoon/hbase,ibmsoe/hbase,intel-hadoop/hbase-rhino,Apache9/hbase,joshelser/hbase,vincentpoon/hbase,intel-hadoop/hbase-rhino,andrewmains12/hbase,andrewmains12/hbase,justintung/hbase,Guavus/hbase,Apache9/hbase,gustavoanatoly/hbase,amyvmiwei/hbase,juwi/hbase,drewpope/hbase,andrewmains12/hbase,gustavoanatoly/hbase,intel-hadoop/hbase-rhino,toshimasa-nasu/hbase,Eshcar/hbase,lshmouse/hbase,amyvmiwei/hbase,ndimiduk/hbase,StackVista/hbase,justintung/hbase,HubSpot/hbase,intel-hadoop/hbase-rhino,justintung/hbase,toshimasa-nasu/hbase,juwi/hbase,bijugs/hbase,apurtell/hbase,vincentpoon/hbase,toshimasa-nasu/hbase,apurtell/hbase,joshelser/hbase,vincentpoon/hbase,ndimiduk/hbase,narendragoyal/hbase,mapr/hbase,gustavoanatoly/hbase,drewpope/hbase,drewpope/hbase,andrewmains12/hbase,Apache9/hbase,lshmouse/hbase,drewpope/hbase,ChinmaySKulkarni/hbase,apurtell/hbase,ultratendency/hbase,andrewmains12/hbase,ChinmaySKulkarni/hbase,bijugs/hbase,intel-hadoop/hbase-rhino,drewpope/hbase,HubSpot/hbase,intel-hadoop/hbase-rhino,vincentpoon/hbase,drewpope/hbase,apurtell/hbase,joshelser/hbase,apurtell/hbase,lshmouse/hbase,francisliu/hbase,SeekerResource/hbase,JingchengDu/hbase,ndimiduk/hbase,Guavus/hbase,mapr/hbase,ndimiduk/hbase,narendragoyal/hbase,ibmsoe/hbase,juwi/hbase,apurtell/hbase,StackVista/hbase,mahak/hbase,ultratendency/hbase,toshimasa-nasu/hbase,Eshcar/hbase,andrewmains12/hbase,SeekerResource/hbase,mahak/hbase,HubSpot/hbase,JingchengDu/hbase,ndimiduk/hbase,ultratendency/hbase,joshelser/hbase,ChinmaySKulkarni/hbase,francisliu/hbase,narendragoyal/hbase,drewpope/hbase,JingchengDu/hbase,andrewmains12/hbase,narendragoyal/hbase,apurtell/hbase,ultratendency/hbase,Eshcar/hbase,apurtell/hbase,ChinmaySKulkarni/hbase,francisliu/hbase,ndimiduk/hbase,narendragoyal/hbase,bijugs/hbase,amyvmiwei/hbase,ChinmaySKulkarni/hbase,ndimiduk/hbase,ibmsoe/hbase,mapr/hbase,joshelser/hbase,amyvmiwei/hbase,joshelser/hbase,SeekerResource/hbase,joshelser/hbase,apurtell/hbase,StackVista/hbase