#19 Support Apache compatible apr1 passwd hashes

[Eric]

Apache uses a custom password hashing format which is based on MD5. It would be quite handy for Jasypt to support APR1

This was discussed on the user support forum: http://forum.jasypt.org/Generate-htpasswd-compatible-hashes-td4922879.html#a5042560

BSD style licensed Java code to generate and validate these hashes: https://github.com/edalquist/nexus-rut-auth-plugin/blob/master/nexus-rut-auth-plugin/src/main/java/edu/wisc/nexus/auth/rut/dao/MD5Crypt.java