Bare bones of new json and png handling implemented.
Graphical tweaks.
Merge branch 'master' of http://github.com/PeterReid/tagpro-map-editor
When wire tool is selected, selecting a tile will change the tool to pencil.
Merge branch 'master' of http://github.com/PeterReid/tagpro-map-editor
Merge branch 'master' of http://github.com/PeterReid/tagpro-map-editor

Conflicts:
	static/index.html
Rectangle tools.