Initial checkin of TA for DUO security

This is the rough stubbing the TA.  More work needs to be done to get the inputs defined, specify local branches, etc
Adding first round of inputs.conf.  Will definitely need tweaking
Pulling out external repository, and adding script to facilitate pulling in when cloning
Change splunk.py from a symlink to a hardlink to get the PYTHONPATH working
Adding an index specification
Adding readme for local configuration
Prepping for submissiong to GitHub