Type definitions and tests for generic-functions (#9309)

* Create generic-functions.d.ts

* Create genetic-functions-tests.ts

* Update generic-functions.d.ts

generic-functions/generic-functions.d.ts

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+// Type definitions for generic-functions
+// Project: https://github.com/stpettersens/generic-functions
+// Definitions by: Sam Saint-Pettersen <https://github.com/stpettersens>
+// Definitions: https://github.com/definitelytyped/DefinitelyTyped
+
+declare module "generic-functions" {
+    function strcmp(str1: string, str2: string): boolean;
+    function icstrcmp(str1: string, str2: string): boolean;
+    function strendswith(str: string, suffix: string): boolean;
+    function icstrendswith(str: string, suffix: string): boolean;
+    function endswithdot(str: string): string;
+    function println(message: string): void;
+    function printlns(message: string[]): void;
+    function objGetKeyByValue(object: Object, value: any): string;
+}

generic-functions/genetic-functions-tests.ts

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+/// <reference path="generic-functions.d.ts" />
+
+import g = require('generic-functions');
+
+var tvShow: Object = {
+  seasons: 2,
+  show: "Better Call Saul"
+};
+
+console.log(g.strcmp("foo", "foo"));  // => true
+console.log(g.icstrcmp("BAR", "bar")); // => true
+console.log(g.strendswith("file.pdf", "pdf")); // => true
+console.log(g.icstrendswith("file.PDF", "pdf")); // => true
+console.log(g.endswithdot("file.pdf")); // => ".pdf"
+console.log(g.objGetKeyByValue(tvShow, 2)); // => "seasons"
+console.log(g.objGetKeyByValue(tvShow, "Better Call Saul")); // => "show"