Add input file glob support to minify()

test/input/issue-1242/bar.es5

@@ -0,0 +1,4 @@
+function bar(x) {
+    var triple = x * (2 + 1);
+    return triple;
+}

test/input/issue-1242/baz.es5

@@ -0,0 +1,4 @@
+function baz(x) {
+    var half = x / 2;
+    return half;
+}

test/input/issue-1242/foo.es5

@@ -0,0 +1,5 @@
+var print = console.log.bind(console);
+function foo(x) {
+    var twice = x * 2;
+    print('Foo:', twice);
+}

test/input/issue-1242/qux.js

@@ -0,0 +1,4 @@
+var a = bar(1+2);
+var b = baz(3+9);
+print('q' + 'u' + 'x', a, b);
+foo(5+6);