added footer, bug fix in communication protocol handshake part and fixed pdf
Revert "added footer, bug fix in communication protocol handshake part and fixed pdf"

This reverts commit cb9c201c32fa0864b7aee0b86add1a8c4e97dcea.
Merge branch 'without_paperjs' of github.com:FrancescoCrecchi/Classpad into without_paperjs
modified service port