Add encoding and compression documentation to the schema design guide
Add encoding and compression documentation to the schema design guide

Change-Id: I7a7e8ab02b11d5b5face48d0e3dccc28d08c1c00
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/8510
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>
Tested-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>

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