Branding: "packager" -> "Metro Bundler"

Summary:
This diff renames all the stragglers in comments and strings from variations of "packager" to "Metro Bundler". I did one of three:

* Rename "packager" to "Metro Bundler"
* Rename "react-native-packager" to "Metro Bundler"
* Remove "packager" when code inside of Metro implies that it's about Metro

I also removed `Glossary.md` because it is unmaintained and very old. mjesun is currently starting to write documentation for Metro which will supersede whatever was there before.

Reviewed By: mjesun

Differential Revision: D5802993

fbshipit-source-id: ba99cb5ed04d84b0f7b7a8a0bf28ed99280a940a

local-cli/server/server.js

@@ -27,14 +27,14 @@ function server(argv: mixed, config: RNConfig, allArgs: Object) {
 
   const startedCallback = logReporter => {
     logReporter.update({
-      type: 'initialize_packager_started',
+      type: 'initialize_started',
       port: args.port,
       projectRoots: args.projectRoots,
     });
 
     process.on('uncaughtException', error => {
       logReporter.update({
-        type: 'initialize_packager_failed',
+        type: 'initialize_failed',
         port: args.port,
         error,
       });
@@ -45,7 +45,7 @@ function server(argv: mixed, config: RNConfig, allArgs: Object) {
 
   const readyCallback = logReporter => {
     logReporter.update({
-      type: 'initialize_packager_done',
+      type: 'initialize_done',
     });
   };
   const runServerArgs: RunServerArgs = args;