Adding a Maven configuration file and restructuring the source files accordingly
New API response scheme

Adding implementations of get_balance and get_new_address along with a
more abstract implementation of the response parsing
Revert "New API response scheme"

This reverts commit b6f06d6a1412545cc750d037c7be010b68aa6b61.
Revert "Revert "New API response scheme""

This reverts commit 3f4eff24521d307fd1c0691ab4e3df8e871a0356.