Fix photo & camera permission management (#140)

* Check photo & camera perms and alert the user if not available (close #64)

- Adds perms checks with a prompt to update settings if needed
- Moves initial access of photos in the composer so that the initial prompt
  occurs at an intuitive time.

* Add react-native-permissions test mock

* Fix issue causing multiple access requests

* Use longer var names

* Update podfile.lock

* Lint fix

* Move photo perm request in composer to the gallery btn instead of when the carousel is opened

ios/Podfile

@@ -44,6 +44,11 @@ target 'app' do
     :app_path => "#{Pod::Config.instance.installation_root}/.."
   )
 
+  # react-native-permissions settings
+  permissions_path = '../node_modules/react-native-permissions/ios'
+  pod 'Permission-Camera', :path => "#{permissions_path}/Camera"
+  pod 'Permission-PhotoLibrary', :path => "#{permissions_path}/PhotoLibrary"
+
   target 'appTests' do
     inherit! :complete
     # Pods for testing