Add 1.5.1 CB <-> obfuscated compact srg mappings

java -jar ../SpecialSource/target/SpecialSource-1.5-SNAPSHOT-shaded.jar -b minecraft_server151.jar -a minecraft-server-1.5.1.jar -c -q > 1.5.1/cb2obf.csrg
java -jar ../SpecialSource/target/SpecialSource-1.5-SNAPSHOT-shaded.jar -a minecraft_server151.jar -b minecraft-server-1.5.1.jar -c -q > 1.5.1/obf2cb.csrg