Update rebar ebuilds and add overlint-cli invocation to Jenkinsfile;

Jenkinsfile

@@ -5,4 +5,7 @@ build('gentoo-overlay', 'gentoo') {
   runStage('RepoMan scours the neighborhood') {
     sh 'repoman -v'
   }
+  runStage('Overlint') {
+    sh 'overlint-cli .'
+  }
 }

dev-util/rebar/rebar-3.1.1-r1.ebuild

@@ -19,7 +19,7 @@ RDEPEND="${DEPEND}"
 S="${WORKDIR}/rebar3-${PV}"
 
 src_compile() {
-	./bootstrap
+	./bootstrap || die "Rebar bootstrap failed!"
 }
 src_install() {
 	exeinto /usr/bin

dev-util/rebar/rebar-3.3.5-r1.ebuild

@@ -0,0 +1,28 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+DESCRIPTION="Erlang build tool that makes it easy to compile and test Erlang applications"
+HOMEPAGE="http://rebar3.org/"
+SRC_URI="https://github.com/erlang/rebar3/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="Apache-2.0"
+SLOT="3"
+KEYWORDS="~amd64"
+RESTRICT="mirror"
+
+DEPEND="<dev-lang/erlang-20"
+RDEPEND="${DEPEND}"
+
+S="${WORKDIR}/rebar3-${PV}"
+
+src_compile() {
+	./bootstrap || die "Rebar bootstrap failed!"
+}
+src_install() {
+	exeinto /usr/bin
+	doexe rebar3
+	dodoc README.md
+}