test: Add gitattributes for test data files

This ensures that the tests pass on Windows regardless of the user's git
CRLF settings.

diff --git a/.gitattributes b/.gitattributes
new file mode 100644 (file)
index 0000000..facf16e
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+# Tests of static file handling assume unix-style line endings.
+tornado/test/static/*.txt text eol=lf
+tornado/test/static/dir/*.html text eol=lf
+tornado/test/templates/*.html text eol=lf