add 'New' button to mindmap/index.html
add border, size for each div elements
add Node representation
refactoring class Node
add Mindmap representation
apply coffeescript coding convention
svg use arbitary height and width so no need to set these attributes
add Node.setPosition()
add Node.getWidth(), Node.getHeight()
size of #draw_canvas should be the same as its div parent
implement addRootNode()
refactoring
implement removeAllNodes
Renamed to core.js. This contain core library for using in mindmap
add tools.js module
link 'New' button to js script
Merge remote-tracking branch 'origin/master'

Conflicts:
	app/assets/stylesheets/mindmap.css.scss
	app/views/mindmap/index.html.erb