Merge pull request #51 from defaude/master

Adding definition for require.context.

Author: s-panferov

lib/runtime.d.ts

@@ -10,6 +10,11 @@ interface WebpackRequire {
     (id: string): any;
     (paths: string[], callback: (...modules: any[]) => void): void;
     ensure(ids: string[], callback: WebpackRequireEnsureCallback, chunkName?: string): void;
+    context(directory: string, useSubDirectories?: boolean, regExp?: RegExp): WebpackContext;
+}
+
+interface WebpackContext extends WebpackRequire {
+    keys(): string[];
 }
 
 declare var require: WebpackRequire;