修改JSHint配置

根据实际情况修改和增加了配置
增加expr配置
remove image directory
modified version
细节修改

1，删除无用信息；
2，修改css压缩文件名为包+版本
fix wrong config placed in jshint section
增加scripturl配置
read jshint options from jshintrc file

Be aware that jshintrc settings are not merged with your Grunt options.
fix jshintrc error
fix gruntfile watch config
new bug fixed version
remove node 0.8 testing
Merge pull request #2 from hiwanz/master

拉取变更集至Jan 24, 2014  "version": "0.3.8"。