get CSR rating from a website for a unit page
getCSRRating_unit(page, date, proxy = NULL)on Which page you want to scrap
represents the date is until which date, usually it's the last day of a year e.g., "2015-12-31" for the date of year 2015, "2014-12-31" for the date of year 2014
whether use the proxy, default is FALSE
A table of CSR ratings collected from your input page
Get CSR ratings and reports of different companies from http://stockdata.stock.hexun.com/zrbg/
www.hexun.com