Added initial feature of profiles

[christianh814]

Fixes #8

Added the "profile" feature by creating a run sub command that looks in ~/.bekind/profiles directory and runs the start subcommand using the ~/.bekind/profiles/{{name}}/config.yaml file for the configuration.

So far:

• Profile name will be based on a directory: ~/.bekind/profiles/{{name}}
• When called, it'll run the config file found in the profile: ~/.bekind/profiles/{{name}}/config.yaml
• The name of the KIND cluster is the name of the profile unless otherwise specified
• Tab completion should work