Merge basic mapviewer

circleMarker zooms to bounds. marker should do the same
Tooltip titles for marker and circleMarker to be implemented
Use g1.scale
attr: {color: 'red'} should be moved to options: {color: 'red'}
Rename attr: to attrs:
Add tooltips to show one or more columns

Edited May 23, 2018 by Tejesh

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