AOT compile tools.reader for version guarantees

Older versions of clojure.tools.reader increase all line numbers by one.
This results in odd looking reports where you have comments or blank
lines showing as missing test coverage or weirder still as being covered
if you have one of these older versions of clojure.tools.reader being
pulled in transitively by another dependency.

AOT compilation of tools.reader is necessary because configuring
:exclusions for tools.reader on those dependencies which pull in the old
version is ineffective when that dependency is using AOT (case in point:
riemann). Unfortunately leiningen isn't doing the smart thing of using
the newer but uncompiled version of a dependency yet. The only work
around is fragile and untenable with a CI service. See the following
github issues for more info:
technomancy/leiningen#1879
technomancy/leiningen#1858

cloverage/project.clj

@@ -6,6 +6,7 @@
         :url  "https://www.github.com/lshift/cloverage"
         :tag  "HEAD"}
   :main ^:skip-aot cloverage.coverage
+  :aot [clojure.tools.reader]
   :license {:name "Eclipse Public License - v 1.0"
             :url "http://www.eclipse.org/legal/epl-v10.html"
             :distribution :repo