Implemented MacAddress model to replace macnificent class

[exceptionfactory]

Refactored to replace dependency on macnificent.MacAddress to address issue #16 with builds failing on Apache Maven 3.8.1.

• Followed implementation from com.martiansoftware.macnificent.MacAddress
• Removed dependency on com.martiansoftware:macnificent
• Changed slf4j-log4j12 to test dependency and added slf4j-api dependency
• Upgraded hibernate-validator to 5.4.3.Final and added required org.glassfish:javax.el dependency for testing