Merge pull request #1 from hcoles/master

Java client starter
Removed 'mutation score' from the batch submission schema
Merge branch 'master' of https://github.com/sebrose/mutation-web-service

Bring in PR from Henry Coles
Refactoring CheckoutServer
Refactor to more, smaller classes
Refactored to use files for batch, pricelist and requirements
Refactoring handlers to push logic into Team
Added more round requirements
Can now price and buy by weight
Error checking for Entry & Item construction
Can now set up batch & price list data for acceptance tests
Refactored acceptance tests
BOGOF offer added