Update version

Update deps and Elixir version (#3)

* mix.exs bump versions (elixir 1.4), quiet warnings

* fix test syntax wrt exspec dropping its 'describe'

* quiet warnings on funcall

* bump versions in travis.ci

* bump vers in readme

* rebuild docs

* maybe fix coveralls? change github link and add myself

* strip out coveralls, use coverex; update link; update docs

* missed a link