ColdFusion - LFI deployer

* README.md
  src/platform/coldfusion/deployers/lfi_stager.py
  -- Exploits unpatched CF servers by log poisoning a small
  stager.  Currently only supports 6/7/8, but work for 9/10
  is currently underway
* src/module/invoke_payload.py
  -- Added support for lfi_stager