adding command line args and making client_id and client_secret secret

- listener.py has one required parameter for the hashtag
- watcher.py has two optional parameters for template and size
- split out CONFIG from checked in code and created a new Instagram
client. When cloning add SECRET.py to src directory and add variable
CONFIG = { 'client_id': '', 'client_serect': '', 'redirect_uri': '' }
to file with Instagram client information
- the directory structure is expected be
root
|
--- downloads
|
--- prints
|
--- src
|
--- templates