Add tslint rule file-header to enforce copyright in TS files (#1396)

I would like to add a "fix" string which this page says is supported:
https://palantir.github.io/tslint/rules/file-header/

But the comment style of the fix doesn't follow our style and is
apparently not configurable.
```
/*!
 * copyright line
 */
```
Fix #1394

Author: rkeithhill

tslint.json

@@ -7,7 +7,8 @@
     "rules": {
         "indent": [true, "spaces", 4],
         "max-classes-per-file": false,
-        "object-literal-sort-keys": false
+        "object-literal-sort-keys": false,
+        "file-header": [true, "Copyright \\(C\\) Microsoft Corporation. All rights reserved."]
     },
     "rulesDirectory": []
 }