finalize the build with jacoco

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hardened machine tests, added simple localization enum for messages, added bank withdrawal tests, added a few more tests

added several null test cases, negative case for change making

idea code format, javadoc cleanup

no more wrapped primitives

functionality complete, added subtract for single Inventory item

pull change making check logic out of checkDisplay

generalized most Bank functionality into Inventory class, updated and added tests, added dumb enum tester to satisfy jacoco

added change calculation, bank withdrawal, display checking calculation, initial vending code, initial product enum, some refactoring and cleanup, some new notes, turned off checkstyle magic numbers

some refactoring: coin return is now a Bank, Banks now auto-populate their maps on construction, added deposit functionality, fully tested Bank, cleaned up Machine

added idea plugin to build.gradle