EditToolbar now sets it's state correctly

Properly determines if it has layers, and then sets the button's disabled class.

fixes #202
Merge pull request #203 from joeybaker/patch-1

EditToolbar now sets it's state correctly
Remove unused toggleClass and code style fixups.
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Use current mouse marker latlng

We should make sure to use the latest mouse marker position, in case current mouse marker has been snapped for example.
Fix virtual nodes position (#207)
Merge pull request #208 from Zverik/master

Fix virtual nodes position (#207)
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Update build
hide tooltip without position
Merge pull request #210 from Zverik/master

Hide tooltip without position
Tweak method for starting labels as hidden.
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Update build
Update Leaflet
Ensure the map has focus when a draw handler has been clicked. fixes #209
Refocus on the map container once the edit/delete handlers have been enabled. refs #209
Build and update changelog.
Fixed image size for retina spritesheet icons