Personal information moved out of Tweetpy.py

Best practices recommend to never include any personal or login information from a public environment like github. Outside of issues about security, to leave this type of information outside of source control makes it easier for project collaborators. Leaving it in would cause the a contributor's personal information to be overwritten any time they update the code. 

The proposal here is to move all personal information and credential into a file called config.json and to add config.json to .gitignore (that's a file that contains a list of all items to ignore). Any python file that requires a personal information would load the json file and refer the values via something of the like  ''consumer_key    = config["consumer_key"]''

config.json obviously is not included in the project. I however provided a file config_template.json that contains a template of its content (without any personal information replace with a placeholder)