Merge pull request #33 from Ar2r/bugfix/exclude_test_data

bugfix: exclude test files from package

.gitattributes

@@ -0,0 +1,11 @@
+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+# Ignore all test and documentation with "export-ignore".
+/.gitattributes      export-ignore
+/.gitignore          export-ignore
+/.php_cs             export-ignore
+/.travis.yml         export-ignore
+/examples            export-ignore
+/guzzle_environments export-ignore
+/tests               export-ignore