PMD report

Problems found

#	File	Line	Problem
1	/Users/dbock/projects/combinatorics/src/test/java/org/loudouncodes/combinatorics/BinaryGrayTest.java	30	Avoid using literals in if statements
2	/Users/dbock/projects/combinatorics/src/test/java/org/loudouncodes/combinatorics/BinaryGrayTest.java	33	Avoid using literals in if statements
3	/Users/dbock/projects/combinatorics/src/test/java/org/loudouncodes/combinatorics/BinaryGrayTest.java	64	Avoid using literals in if statements