update dependencies, with report from lein-ancient

Tests still passing, this is the output from lein-ancient now,
jsonevent-layout and netty must remain at these versions for now.

```
[net.logstash.log4j/jsonevent-layout "1.6"] is available but we use "1.5"
[io.netty/netty "4.0.0.Alpha8"] is available but we use "3.8.0.Final"
[log4j/apache-log4j-extras "1.2.17"] is available but we use "1.0"
[org.antlr/antlr "3.5.2"] is available but we use "3.2"
```
Merge pull request #359 from pyr/new-dependencies

update dependencies, with report from lein-ancient