Add test: testBOMInputStreamRead

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549179 13f79535-47bb-0310-9956-ffa450edef68
Add test: testBOMInputStreamReadByte

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549180 13f79535-47bb-0310-9956-ffa450edef68