Build fail due to non-ascii characters

[jkbonfield]

With jdk1.8.0_74 javac I get errors like:

/nfs/users/nfs_j/jkb/work/cram/cramtools/src/main/java/net/sf/cram/common/Utils.java:641: error: unmappable character for encoding ASCII
		System.out.println(calculateMD5String("??????".getBytes()));
		                                       ^

(Fortunately it's trivial to edit the few places and get a buildable system.)

I also notice there is a non-functioning gradlew in the root dir now. Maybe this should be removed? When I tried "./gradlew jar" is claimed it built, but gave me a cramtools jar with most of the classes missing.