Add tools/run-mypy to Travis checks.

Fixes #635.

.travis.yml

@@ -14,6 +14,10 @@ env:
 language: python
 python:
   - "2.7"
+matrix:
+  include:
+    - python: "3.4"
+      env: TEST_SUITE=mypy
 # command to run tests
 script:
   - ./tools/travis/$TEST_SUITE

tools/travis/mypy

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+set -x
+./tools/run-mypy

tools/travis/setup-mypy

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+set -x
+pip install "six==1.10.0"
+pip install "git+https://github.com/python/mypy.git@5d2dfce8cf6b9a0a7ce8fe8e3cb5866094459f8c"