Add in a task to give a formatted vector of the latest version of a
dependency, ready for direct insertion into a project.clj
Neaten get-latest function
Refactored common parts in 'get' and 'latest' tasks.
Updated README and Docstrings.
Using [rewrite-clj "0.3.1"].
Added Link to latest-clojure-libraries plugin.
Updated Changelog.
Release 0.5.0