SAS7BDAT -> iterator skips header
SAS7BDAT -> iterator skips header

- test for roundtrip through SQL
- force append(Table, SAS) to get version of iterator that skips
  header
- clean up unnecessary commits

quantopian/odo,ContinuumIO/odo,ContinuumIO/odo,quantopian/odo,Dannnno/odo,alexmojaki/odo,mrocklin/into,cpcloud/odo,ywang007/odo,cowlicks/odo,blaze/odo,cowlicks/odo,Dannnno/odo,alexmojaki/odo,mrocklin/into,ywang007/odo,cpcloud/odo,blaze/odo