update tox for py37 and build signing

tox.ini

@@ -1,7 +1,7 @@
 # tox testing configuration
 
 [tox]
-envlist = py27,py33,py34,py35,py36,flake8,bandit,readme
+envlist = py27,py33,py34,py35,py36,py37,flake8,bandit,readme
 skip_missing_interpreters=true
 
 [testenv]
@@ -61,7 +61,7 @@ commands =
     python setup.py check -m -r -s
     doc8 README.rst
 
-# RELEASE tooling
+# RELEASE tooling - non signed
 [testenv:build]
 basepython = python2.7
 skip_install = true
@@ -81,6 +81,29 @@ commands =
     {[testenv:build]commands}
     twine upload --skip-existing dist/*
 
+# RELEASE tooling - signed - requires PGP certs
+[testenv:buildsign]
+basepython = python2.7
+skip_install = true
+deps =
+    wheel
+    setuptools
+commands =
+    python setup.py -q sdist bdist_wheel
+    /bin/bash -c 'for filename in dist/*; do gpg --detach-sign -a $filename; done'
+
+
+[testenv:releasesign]
+basepython = python2.7
+skip_install = true
+deps =
+    {[testenv:build]deps}
+    twine >= 1.5.0
+commands =
+    {[testenv:build]commands}
+    twine upload --skip-existing dist/*.gz dist/*.gz.asc
+    twine upload --skip-existing dist/*.whl dist/*.whl.asc
+
 [flake8]
 ignore = D203,H301,H306,E402
 max-line-length = 100