Remove unwanted whitespace
使用 grunt.verbose 代替 grunt.log

讨论:
https://github.com/dexteryy/grunt-dispatch/issues/1
grunt.verbose 和 grunt.log 区别:
http://gruntjs.com/api/grunt.log#verbose-and-notverbose
添加 summary 信息
Merge pull request #2 from hxgdzyuyi/dev

替换 grunt.log 为 grunt.verbose