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..
Add type hints.
Merge pull request #3 from candera/master

Add type hints.
Merge branch 'master' into 0.6-rk

Conflicts:
	src/flux/response.clj