new sis initial commit

testing for new sis
fixed parsing errors, improved sis code

fixed partial parsing error by importing lxml lib and improved sis login and parsing data code
fixed date parsing

fixed date parsing
updated readme
added new line at the end
updated HTTP error codes
Merge branch 'master' of https://github.com/advaitkunte/sis-msr-gae

merge
Refactored the code