Add .gitignore

Ignore /testcases/yours/* as they are autogenerated on run
Ignore /classes as they are autogenerated on compile
Remove files in testcases/yours/
Refactor total++ that is in both if and else
Change usage message

- New class name
- New URL format
Merge pull request #4 from cflee/misc-changes

1. Add .gitignore
2. Delete files in testcases/yours/since they are auto-generated on each run
3. Change usage message
4. Refactor out a total++ that is in both if and else