Update dependencies, especially jBCrypt.

[brunchboy]

jBCrypt-0.4 fixes an integer overflow which occurs with very large
log_rounds values. In order to incorporate that fix, I had to switch to
a different Maven artifact which tracks more recent releases of
jBCrypt.

While updating that, I updated the other dependencies (apart from
Clojure itself). If you would like to update those separately, I can
certainly understand that. Alternately, you may want to update Clojure
as well, now that the final release of 1.8 is out.

[brunchboy]

Ah, sigh. Apparently the de.svenkubiak/jBCrypt artifact was compiled to Java 8 classes, making it incompatible with the Java 7 environment of this build, so this update may not be feasible. Perhaps we can persuade the maintainer of the jBCrypt artifact you started out using to update to jBCrypt version 0.4.

But for now, I will just use my fork, since I am working in a Java 8 environment.