updated package builds for debian, arch, gentoo; updated readme a little

gentoo/pgpy-0.4.0.ebuild

@@ -0,0 +1,34 @@
+# Copyright 2014 Michael Greene
+# Distributed under the terms of the BSD 3-Clause License
+# $HEADER: $
+
+EAPI=5
+PYTHON_COMPAT=( python{2_7,3_3,3_4,3_5} )
+
+inherit distutils-r1
+
+DESCRIPTION="Pretty Good Privacy for Python - a pure Python OpenPGP implementation."
+HOMEPAGE="https://github.com/SecurityInnovation/PGPy"
+SRC_URI="mirror://pypi/P/PGPy/PGPy-${PV}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE=""
+
+DEPEND="dev-python/setuptools[${PYTHON_USEDEP}]"
+RDEPEND="dev-python/singledispatch[${PYTHON_USEDEP}]
+         dev-python/pyasn1[${PYTHON_USEDEP}]
+         >=dev-python/six-1.9.0[${PYTHON_USEDEP}]
+         >=dev-python/cryptography-1.1.0[${PYTHON_USEDEP}]
+         $(python_gen_cond_dep 'dev-python/enum34[${PYTHON_USEDEP}]' python2_7 python3_3)"
+DOCS=( README.rst )
+
+src_unpack() {
+    if [ "${A}" != "" ]; then
+        unpack ${A}
+    fi
+
+    cd "${WORKDIR}"
+    mv PGPy-${PV} pgpy-${PV}
+}