fetch the lastest version of lein
Merge branch 'lastest' of https://github.com/siscia/docker-clojure into siscia-lastest

* 'lastest' of https://github.com/siscia/docker-clojure:
  fetch the lastest version of lein

Conflicts:
	Dockerfile
Merge branch 'siscia-lastest'

* siscia-lastest:
  fetch the lastest version of lein