Update deps, remove generated files.

Author: taeold

.gitignore

@@ -6,6 +6,8 @@ coverage
 docgen/html
 docgen/*/temp
 docgen/*/markdown
+docgen/*/*.json
+docgen/*/*.md
 firebase-functions-*.tgz
 integration_test/.firebaserc
 integration_test/*.log
@@ -16,4 +18,4 @@ node_modules
 npm-debug.log
 typings
 yarn.lock
-.DS_Store
+.DS_Store