lass.py enhancement

[wjmuse]

1. Enable to set filter to let KML or JSON to appear only one type of sensor value on map place spot.
2. Filter should support device id or sensor id.
3. Fix lass.R to do some visualization.

[wuulong]

&1 : Suggest to export all datas. And highlight one special sensor which is sensor_curr in the lass.py
&2 : Remind current lass.py already support device_id filter. What is sensor_id? The specification suggest to enable regular expression filter for the data. These method will have more flexible filter option
&3 : What problem you saw in current lass.R?

[wjmuse]

@wuulong Thanks for your comment.
&1, &2, I think sensor_curr should be able to used as what I've thought about sensor filter. I'll follow up this as your suggestion.
&3, It may not has any problem, just make a note for myself to do some enhancement for new ver_app. :)