Added argparse.py, hlt.py and setup_cff.py

Added argparse.py for Python < 2.7 from https://code.google.com/p/argparse/ .

Added hlt.py and setup_cff.py by running:
```
hltGetConfiguration orcoff:/cdaq/physics/Run2012/8e33/v2.1/HLT/V7 --full --offline --data --no-output --process TEST --globaltag auto:hltonline > hlt.py
edmConfigFromDB --cff --orcoff --configName /cdaq/physics/Run2012/8e33/v2.1/HLT/V7 --nopaths > setup_cff.py
```
Added hlt_MET.py and hlt_JetHT.py.

hlt_MET.py and hlt_JetHT.py were downloaded from http://foton.fizik.anadolu.edu.tr/halil/openHLT/ . From meta.txt: "An hlt_XXX.py file is an HLT dump which includes only the trigger paths that belong to the dataset XXX. Note that these dumps may or may not include prescaled paths". They are based on Run2012/8e33/v2.1/HLT/V7 menu.