Translate plugin, using the Yandex translate API.

An API key is required, you can put the key in config.json,
such as `{"translate":{"apiKey":"..."}}`.
Weather plugin, using the OpenWeatherMap API.

An API key is required, you can put they key in config.json,
such as `{"weather":{"apiKey":"..."}}`.
fix coding style
Merge pull request #8 from SBSTP/plugin-translate

Translate plugin, using the Yandex translate API.
Merge pull request #9 from SBSTP/plugin-weather

Weather plugin, using the OpenWeatherMap API.
Relax the README
Update README.md

I thought that specifying the server might be a good idea.