README: Clarifications and improvements
README: Clarifications and improvements

From Ramiro Morales. Thanks, Ramiro!
https://pymssql.googlecode.com/issues/attachment?aid=1200005000&name=issue120.patch&token=_AURVCWZscaXuIp2gT76C1y75Bg%3A1375824746443

Alwnikrotikz/pymssql,google-code-export/pymssql,google-code-export/pymssql,thegooglecodearchive/pymssql,Alwnikrotikz/pymssql,AlanZatarain/pymssql,thegooglecodearchive/pymssql,djhenderson/pymssql,Alwnikrotikz/pymssql,google-code-export/pymssql,djhenderson/pymssql,MunDaesik/pymssql,djhenderson/pymssql,thegooglecodearchive/pymssql,AlanZatarain/pymssql,MunDaesik/pymssql,MunDaesik/pymssql,AlanZatarain/pymssql