Preserve docs in npm package (tensorflow#1533)

DOC
This fixes tensorflow/tfjs#1180 and allows users to see docs in code editors like vscode.

Note that the docs are still removed from the minified bundle.

Author: tafsiri

tsconfig.json

@@ -4,7 +4,7 @@
     "moduleResolution": "node",
     "noImplicitAny": true,
     "sourceMap": true,
-    "removeComments": true,
+    "removeComments": false,
     "preserveConstEnums": true,
     "declaration": true,
     "target": "es5",