Create maven project
Added log4j logger

	modified:   .gitignore
	modified:   pom.xml
	new file:   src/main/java/com/java/challenge/data/DayOfWeek.java
	deleted:    src/main/java/com/java/challenge/data/DaysOfWeek.java
	modified:   src/main/java/com/java/challenge/data/FlexibleDay.java
	modified:   src/main/java/com/java/challenge/data/SimpleDay.java
	modified:   src/main/java/com/java/challenge/data/SpecificDay.java
	modified:   src/main/java/com/java/challenge/main/Challenge.java
	modified:   src/main/java/com/java/challenge/service/BusinessHourCalculator.java
	modified:   src/main/java/com/java/challenge/service/helper/BusinessHourCalculatorHelper.java
	modified:   src/test/java/com/java/challenge/service/BusinessHourCalculatorTest.java

Changes with git ignore