python-cryptography: new package (closes #2035)

From the README:

cryptography is a package which provides cryptographic recipes and
primitives to Python developers.  Our goal is for it to be your "cryptographic
standard library". It supports Python 2.6-2.7, Python 3.3+, and PyPy 2.6+.

This depends on python-cffi host install (#2034)

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

[Squashed update to latest upstream version into this introducing commit]

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/python-cryptography/Makefile

@@ -0,0 +1,53 @@
+#
+# Copyright (C) 2015 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=cryptography
+PKG_VERSION:=1.1.2
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://pypi.python.org/packages/source/c/cryptography
+PKG_MD5SUM:=15eeba9e31f852bac21155baa3dfbc61
+
+PKG_BUILD_DEPENDS:=python-cffi/host
+
+PKG_LICENSE:=Apache-2.0 BSD-3-Clause
+PKG_LICENSE_FILES:=LICENSE.APACHE LICENSE.BSD
+PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
+
+include $(INCLUDE_DIR)/package.mk
+$(call include_mk, python-package.mk)
+
+define Package/python-cryptography
+	SECTION:=lang
+	CATEGORY:=Languages
+	SUBMENU:=Python
+	TITLE:=python-cryptography
+	URL:=https://github.com/pyca/cryptography
+	DEPENDS:=+libopenssl +python +python-cffi +python-enum34 +python-idna +python-ipaddress +python-pyasn1 +python-six +python-setuptools
+endef
+
+define Package/python-cryptography/description
+cryptography is a package which provides cryptographic recipes and
+primitives to Python developers.  Our goal is for it to be your "cryptographic
+standard library". It supports Python 2.6-2.7, Python 3.3+, and PyPy 2.6+.
+endef
+
+define PyPackage/python-cryptography/filespec
++|$(PYTHON_PKG_DIR)
+-|$(PYTHON_PKG_DIR)/cryptography/hazmat/backends/commoncrypto
+-|$(PYTHON_PKG_DIR)/cryptography/hazmat/bindings/commoncrypto
+endef
+
+define Build/Compile
+	$(call Build/Compile/PyMod,,install --prefix="/usr" --root="$(PKG_INSTALL_DIR)")
+endef
+
+$(eval $(call PyPackage,python-cryptography))
+$(eval $(call BuildPackage,python-cryptography))