Clean up tooltip content for binned fields

[light-and-salt]

Related issue: https://github.com/vega/vega-lite-ui/issues/167

[light-and-salt]

Right now for binned fields tooltip shows: start, mid, end, and range. I also notice sometimes range can be empty.

When range is available, we should show field name and range. When range is not available, we should use start and end to compute a range for tooltip to display (?)

Case 1

Tooltip should show: Rotten_Tomatoes_Rating: 90-100, IMDB_Rating: 6-7

Case 2

Tooltip should show: Acceleration: 10-15

Case 3

Tooltip should show: Acceleration: 15-20

[kanitw]

Why dont you just read start and end and always produce one row that shows
range and make thhe label just say bin_x

People dont need 3-4 rows to understand one data field.

On Fri, Apr 8, 2016 at 10:09 AM Zening notifications@github.com wrote:

Right now for binned fields tooltip shows: start, mid, end, and range. I
also notice sometimes range can be empty.

When range is available, we should show field name and range. When range
is not available, we should use start and end to compute a range for
tooltip to display (?)

Case 1
[image: bin1]
https://cloud.githubusercontent.com/assets/822034/14391443/e35faab2-fd70-11e5-90b6-a72284ace44f.png
Tooltip should show: Rotten_Tomatoes_Rating: 90-100, IMDB_Rating: 6-7

Case 2
[image: bin2]
https://cloud.githubusercontent.com/assets/822034/14391479/08de74e4-fd71-11e5-8c97-3dffaca4e96a.png
Tooltip should show: Acceleration: 10-15

Case 3
[image: bin3point]
https://cloud.githubusercontent.com/assets/822034/14391497/1c5af394-fd71-11e5-8468-6fd06783b1cb.png
Tooltip should show: Acceleration: 15-20

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#29 (comment)

[light-and-salt]

This is part of PR #36.