Preliminary backend implementation for user account creation
added git ignore file to exclude class files
removed residual lab sample files
added NFS files to ignore list
Changed color of navbar
Changed icon sizes and cleaned up formatting
added smaller sized sprites
Added dividing line to footer
back end functionality to adding users; HAS NOT BEEN TESTED
fix compiler errors
back end functionality to adding users; HAS NOT BEEN TESTED
Added method to generate person_id
fixed compiler errors
Cleaned up import statements
fix import statements
Fix compiler error
Fixed servlet mapping
Functional error messages for non-existing users
added new icons to nav bar
fixed spacing between icons