Put env data model to envModel.js.
Move demand_unit & antenna_gain_on to env data.
Fix some bugs.(value is String, undefined test)
Batch-Add-Node is back.
Draw different color by AP index (instead of wifi strength) is possible.
Mix transformWall/Area to drawWall/Area.
First commit for "develop" branch.
We should work in this branch instead of "master".
Load nodes.json could apply all node settings.
addMarker() input is all node settings(x/y in coord).