Bumped Clojure to 1.6.0

* https://github.com/mwmitchell/flux/issues/1
bumped version
bumped solr j and core to 4.9.0
midge updates

* bumped to 1.6.3
* added lein-midje as dev plugin - v 3.1.1
added slf4j-log4j12 dev dependency
README updates etc..
Merge remote-tracking branch 'origin/master' into refactor-tephrosia