Added distance.js as a file

Ref #54
Added an image for distance

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Added a modal for distance calculating.

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Getting the two nodes (and only two) works now!

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Got basic distance calculating working.

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Set loc1 and loc2 to undefined after.

You want to make sure that you can check
more distances without having to refresh!
Now it draws lines!

Ref #54
Updated width and color of line

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Remove line upon clicking on it
Fixed problem with the id name.

name was being used an id both for the map name
and the name when creating a node, which caused
some css issues. the id for the map name is now
mapname, and the other is just left as name.
Added a popup on the line hover
Remove popup when the line is removed
Added miles for how far away things are
Round numbers to two decimal places
Added a green node for certain things
Annoying popups are gone during distance calc

Ref #54
Merge branch 'distance' into development