specifying binary files whose line endings should go unchanged

Author: aceslowman

.gitattributes

@@ -4,3 +4,13 @@
 # prevents git from converting LF to CRLF, which causes issues
 # when assembling example pages on Windows
 data/examples/**/*.js eol=lf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.mov binary
+*.mp3 binary
+*.mp4 binary
+*.gif binary
+*.webm binary