GitAttributes for Line Endings

https://help.github.com/articles/dealing-with-line-endings

See ReactiveX#579

.gitattributes

@@ -0,0 +1,15 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.java text
+*.groovy text
+*.scala text
+*.clj text
+*.txt text
+*.md text
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary