Adds author count + leader CodeLens

Upgrades to TypeScript 2
Lots of refactoring and many bug fixes

src/gitContentProvider.ts

@@ -0,0 +1,15 @@
+'use strict';
+import {ExtensionContext, TextDocumentContentProvider, Uri} from 'vscode';
+import {DocumentSchemes} from './constants';
+import GitProvider from './gitProvider';
+
+export default class GitContentProvider implements TextDocumentContentProvider {
+    static scheme = DocumentSchemes.Git;
+
+    constructor(context: ExtensionContext, private git: GitProvider) { }
+
+    provideTextDocumentContent(uri: Uri): string | Thenable<string> {
+        const data = this.git.fromGitUri(uri);
+        return this.git.getVersionedFileText(data.originalFileName || data.fileName, data.sha);
+    }
+}