Added .gitattributes file to prevent git from changing line endings (#1872)

of text files using as data for tests.

.gitattributes

@@ -0,0 +1,2 @@
+/test/www*/dir/*.html text eol=lf
+/test/www*/dir/*.txt text eol=lf

.gitignore

@@ -35,4 +35,5 @@ Release
 ipch
 *.dSYM
 .*
+!/.gitattributes
 !/.travis.yml