update readme to xaod branch
update data containers (Egamma,Muons)
first list of xaod samples

Most of the SUSY1 derivations are still not ready. Using AOD.
This list was made by:
- Get a list of what is available from AMI
  `DC14DataMCSampleInfo > 8 TeV MC`
- Then browse 'ALL EVENTS AVAILABLE' && data type 'AOD'
- Export to txt
- drop from the list what in not in Ximo's list and not in our samples