Move recalculateDimensions() into its own module: recalculate.js

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2436 eee81c28-f429-11dd-99c0-75d572ba1ddd
Add empty test file and update Makefile

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2437 eee81c28-f429-11dd-99c0-75d572ba1ddd