Writing extensions

Risu extensions should conform to the following standards:

• Written in python and stored in the extensions folder.
• Implement some base functions keeping arguments and data returned as in others:
• init()
  • Returns list of triggers (array with strings)
• listplugins(options)
  • Yields plugin object generator based on options.include, options.exclude
• get_description(plugin)
  • Returns string for description based on plugin object
• run(plugin)
  • Returns (returncode, out, err) after running a plugin object
• help()
  • Returns string with description of extension
• Define extension in listplugins as 'back-end' based on the name of the file, so findplugins, runplugin, etc can find it properly and execute.