Fix typo
Add debug mode: Fix #8

  - Add an option "-d" in bin/clara that shows all the command run by the plugins.
  - Add a new class Conf for runtime configuration parameters
  - Based in initial patch by @rezib.
Now we can provide a config.ini file from the command line. Fix #32

Remove the possibility to have a user config file in ~/config/clara/.
It's better to prevent confusion to provide a file explicitily in
the command line when the user doesn't want to use the default one.
Release