JSON file location

Hi,

This is more like a suggestion rather than an issue, but can indicator store its JSON with settings in different directory than $HOME? Preferably $HOME/.config or $HOME/.cache

And while we are on this, why are those paths different?

./sensors.py:52: SETTINGS_FILE = os.getenv("HOME") + '/.indicator-sysmonitor.json'

./preferences.py:222: SETTINGS_FILE = os.getenv("HOME") + '/.cache/indicator-sysmonitor/preferences.json'

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They are recording different things. Yes you are correct, the sensors path should be the same as preferences. Can you throw a pull request and I'll merge?