This is mostly some clean up. Now plugins are checked for existence
before being required. The regex for dynamic values was improved a
little in an attemp to make it more reliable. Plugins are only required
once now.
The CLI's CWD is set to that of the config file. This makes relative
paths mentioned in the file more reliable.
* Added a schema validator.
This allows you to check if the given beau config is valid. Will be used
to improve the CLI and remove schema validation-type errors from the
actual code.
* Added a validate command to the CLI.
This command is a way to test the config file. Eventually it'll probably
be removed and the schema validation will run on every other command. I
have to determine how useful this is and how performance might be
affected.
Sergio Díaz