Revert "Fix #13983. Switch to //# for sourcemaps."

Per the discussion here:
https://code.google.com/p/chromium/issues/detail?id=256636

Thanks to the Chrome team for the quick response!

This reverts commit d53ddc90.

Gruntfile.js

@@ -115,7 +115,7 @@ module.exports = function( grunt ) {
 						"/*! jQuery v<%= pkg.version %> | " +
 						"(c) 2005, 2013 jQuery Foundation, Inc. | " +
 						"jquery.org/license\n" +
-						"//# sourceMappingURL=jquery.min.map\n" +
+						"//@ sourceMappingURL=jquery.min.map\n" +
 						"*/\n"
 				}
 			}

build/release.js

@@ -167,10 +167,10 @@ function makeReleaseCopies( next ) {
 			} else if ( /\.min\.js$/.test( releaseFile ) ) {
 				// Minified files point back to the corresponding map;
 				// again assume one big happy directory.
-				// "//# sourceMappingURL=jquery.min.map"
+				// "//@ sourceMappingURL=jquery.min.map"
 				text = fs.readFileSync( builtFile, "utf8" )
-					.replace( /\/\/# sourceMappingURL=\S+/,
-						"//# sourceMappingURL=" + unpathedFile.replace( /\.js$/, ".map" ) );
+					.replace( /\/\/@ sourceMappingURL=\S+/,
+						"//@ sourceMappingURL=" + unpathedFile.replace( /\.js$/, ".map" ) );
 				fs.writeFileSync( releaseFile, text );
 			} else if ( builtFile !== releaseFile ) {
 				copy( builtFile, releaseFile );