Add support for the Blockstream Jade hww

Supports ssh and gpg, incl. ecdh/decryption.
Initially only supports curve 'nist256p1'.

agents/jade/jade_agent.py

@@ -0,0 +1,7 @@
+import libagent.gpg
+import libagent.ssh
+from libagent.device.jade import BlockstreamJade as DeviceType
+
+ssh_agent = lambda: libagent.ssh.main(DeviceType)
+gpg_tool = lambda: libagent.gpg.main(DeviceType)
+gpg_agent = lambda: libagent.gpg.run_agent(DeviceType)

agents/jade/setup.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+from setuptools import setup
+
+setup(
+    name='jade_agent',
+    version='0.1.0',
+    description='Using Blockstream Jade as hardware SSH agent',
+    author='Jamie C. Driver',
+    author_email='jamie@blockstream.com',
+    url='http://github.com/romanz/trezor-agent',
+    scripts=['jade_agent.py'],
+    install_requires=[
+        # FIXME: will need libagent version that includes jade support - 0.14.5 ??
+        # FIXME: will need to put the tag version just as we are about to apply it ?
+        'libagent>=0.14.4',
+        # Jade py api from github source, v0.1.33
+        'jadepy @ git+https://github.com/Blockstream/Jade.git@0.1.33#egg=jadepy[requests]'
+    ],
+    # Not sure why this doesn't work ...
+    # dependency_links=['https://github.com/Blockstream/Jade/tarball/0.1.33#egg=jadepy[requests]'],
+    platforms=['POSIX'],
+    classifiers=[
+        'Environment :: Console',
+        'Development Status :: 4 - Beta',
+        'Intended Audience :: Developers',
+        'Intended Audience :: Information Technology',
+        'Intended Audience :: System Administrators',
+        'License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)',
+        'Operating System :: POSIX',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+        'Topic :: System :: Networking',
+        'Topic :: Communications',
+        'Topic :: Security',
+        'Topic :: Utilities',
+    ],
+    entry_points={'console_scripts': [
+        'jade-agent = jade_agent:ssh_agent',
+        'jade-gpg = jade_agent:gpg_tool',
+        'jade-gpg-agent = jade_agent:gpg_agent',
+    ]},
+)