* changed file structure and remove some unused files.
 * updated mindmap.
 * fixed errors in image cutter.
 * renamed export to exportData in mindmap.js.
 * fixed style of image cutter.
 + added excanvas.js.
 * built with gruntjs.
 * rebuilt assets with gruntjs.
 * added zentao task to grunt.
* added ranzhi and chanzhi task to grunt.
 * renamed theme.sns.less to theme.team.less.
 * rebuilt.
 * updated config of grunt.
 * remove mindmap from dist and docs.