Update Java version to use a real build system and define dependencies correctly

[davija]

I went to pull this library into my project only to find out that this has absolutely no build system... none...

Please add a build system (e.g.; maven or gradle) and define your dependencies and which versions you are using instead of including them in the lib folder (this is a HUGE no-no in java projects).

[lisaqeen720-del]

PayPal account is saying paid invoice and havent received Funds also Bitcoin balance is is deducteding amounts from balance and is not showing in PayPal balance. Invoice $5000 Bitcoin was $563 now $543 is not going to balance card ending end 5013 Lisa T. Gillard