Further RNPM integration

Summary:
This commit removes `rnpm` folder that we left during initial merge to keep the diff cleaner. The `core`, `link` and `install` have now the same directory structure as any other command to make development more natural for all of us.

From most notable differences:
1) the `src` folder is now gone. The new structure should make it easier for people to work with the stuff and also move us closer to 100% rnpm integration,
2) There's also no `package.json` present in any of the `rnpm` packages, since they are no longer standalone modules,
3) There's no `bugs.url` in link.js since main package.json of React doesn't specify it. Decided to hardcode it to facebook/react-native since it's really unlikely to change. If one would prefer to use pkg.bugs.url as before, a separate PR modifying package.json should be sent.
Closes https://github.com/facebook/react-native/pull/9509

Differential Revision: D3751115

fbshipit-source-id: 74ae8330f7634df0887ad676808f47eee4b8de85

local-cli/install/install.js

@@ -0,0 +1,32 @@
+const spawnSync = require('child_process').spawnSync;
+const log = require('npmlog');
+const spawnOpts = {
+  stdio: 'inherit',
+  stdin: 'inherit',
+};
+
+log.heading = 'rnpm-install';
+
+function install(args, config) {
+  const name = args[0];
+
+  var res = spawnSync('npm', ['install', name, '--save'], spawnOpts);
+
+  if (res.status) {
+    process.exit(res.status);
+  }
+
+  res = spawnSync('rnpm', ['link', name], spawnOpts);
+
+  if (res.status) {
+    process.exit(res.status);
+  }
+
+  log.info(`Module ${name} has been successfully installed & linked`);
+};
+
+module.exports = {
+  func: install,
+  description: 'install and link native dependencies',
+  name: 'install <packageName>',
+};

local-cli/install/uninstall.js

@@ -0,0 +1,32 @@
+const spawnSync = require('child_process').spawnSync;
+const log = require('npmlog');
+const spawnOpts = {
+  stdio: 'inherit',
+  stdin: 'inherit',
+};
+
+log.heading = 'rnpm-install';
+
+function uninstall(args, config) {
+  const name = args[0];
+
+  var res = spawnSync('rnpm', ['unlink', name], spawnOpts);
+
+  if (res.status) {
+    process.exit(res.status);
+  }
+
+  res = spawnSync('npm', ['uninstall', name], spawnOpts);
+
+  if (res.status) {
+    process.exit(res.status);
+  }
+
+  log.info(`Module ${name} has been successfully uninstalled & unlinked`);
+};
+
+module.exports = {
+  func: uninstall,
+  description: 'uninstall and unlink native dependencies',
+  name: 'uninstall <packageName>',
+};