Changed code so that the information needed to connect to the database is passed to it by the server class

Added functionality to remove the employee shift by using the unique shift id to both the server and client side.

added attributes, get/set methods to model

This reverts commit c3032b36

Changed class names to update rather than get, and fixed a small bug in the writer. Implemented getShiftsByWeek.

Converts ip address to InetAddress for ServerSocket constructor call. Set's maximum requests to server to 50. Fixed some warnings.