Files deleted and added

'Person4.java' is modified, the method: calc(String name) has been
fixed. 'AntLabMain.java' now contains the right string name and ID for
person 4. 'useless.p4.txt' has been deleted because it is useless.
'readme.p4.txt' has been added to the repository that tells my choice in
extra credit. Finally, 'cpierce31.gradle' has been added to build my jar
correctly.