[RFC] Code-gen AST types

Author: dittos

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "libgraphqlparser"]
+	path = libgraphqlparser
+	url = https://github.com/graphql/libgraphqlparser.git

.travis.yml

@@ -11,7 +11,7 @@ install:
 - pip install pytest>=2.7.3 --upgrade
 - pip install -e .
 script:
-- py.test --cov=graphql
+- py.test --cov=graphql tests
 - flake8
 after_success:
 - coveralls