Add support for switching accounts about jira-cli HOT 2 OPEN

@miguelmich you're happy with the command itself on the #6 ? it's just the implementation you don't like?

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@fluffels yes, I think there is a better way to handle multiple accounts, the main idea that I have in mind is to save an array of the current credentials object and then it will be easy to "activate" one of those instances like, for example, jira config switch and then display a prompt with the current options.

Apart from this, the implementation that you did looks good, but it should be located in a method inside the config class and not inside the jira.js class which acts like some kind of "command router" between the commander index and the different classes.

The roadmap in order to make this new feature works could be:

1. Add a command to setup multiple accounts using the current config file, and set an "active" parameter which determinates the active instance
2. Modify the current init method in order to get the "active" instance and load it from the start
3. Add config commands to modify & remove the different instances

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