Simplify .gitattributes.

.gitattributes

 # Enforce Unix newlines
-*.css   text eol=lf
-*.html  text eol=lf
-*.js    text eol=lf
-*.json  text eol=lf
-*.md    text eol=lf
-*.rb    text eol=lf
-*.scss  text eol=lf
-*.svg   text eol=lf
-*.txt   text eol=lf
-*.xml   text eol=lf
-*.yml   text eol=lf
+* text=auto eol=lf
 
 # Don't diff or textually merge source maps
 *.map   binary