Add checkstyle formatter

跟 --format=xml 类似，不过是另外一种 xml 格式而已，输出的内容是给
webstorm 的 jscs 插件用的
Merge pull request #12 from ecomfe/0.1/feature/6

Add checkstyle formatter
bump to 0.0.9
typo...change rcloader to rcloader2
bump to 0.0.10
add safe option for keeping line break in source
add options for fixmyjs, fix #13
support `safe` option and configuration for jformatter, fix #13
add jshint package
add default configuration for jformatter
bump to 0.0.11
exchange `warn` and `error` code, fix #14
bump to 0.0.12
insure callback, fix #15
bump to 0.0.13
set DEBUG env
fix documentation
change stripJsonComments to inner function
make sure `chr` is a char
add parseError function