README refresh, added new payload flag

* README.md
  -- Refreshed to version 0.3
* src/core/deployer.py
  src/core/parse_cmd.py
  -- Added the --rand-payload flag, which will randomize the deploying
  file with a 5 character name.  This can help if you have a payload
  file that you don't want deployed with any suspicious context, such
  as "shell" or "reverse_meterpreter"
* src/module/invoke_payload.py
  -- When invoking payloads, only print the context, not the full path
* src/platform/railo/authenticate.py
  -- Display an error on unsupported auth interfaces
Merge branch 'dev' of https://github.com/hatRiot/clusterd into dev