2b - App Store Readiness - Missing Toast

[jterps08]

We need to include toast for critical actions so that users realize that they're action was executed successfully. All toast should appear on the bottom.

May be useful -> https://github.com/magicismight/react-native-root-toast

In Scope - Limited Basic toast

1. Upvoting/downvoting from newsfeed or from item detail screen - "Upvoted" "Downvoted"
2. Following user from Newsfeed (Follow this item's author on dropdown menu), Notification Feed, user profile, or Group Members screen "Follow Request sent!"
3. Creating a post, user-petition, or making a comment ("Post Successful!" "Petition Successful!" "Comment Successful!")
4. User Post/Petition edited or deleted successfully (e.g. "Edits saved" or "Item Deleted")

Out of Scope - features not built yet

1. Saving/Removing an item to Favorites (Saved to Favorites / Removed from Favorites)
2. Subscribing/Unsubscribing to an Item (Subscribed to item / Unsubscribed from item)
3. Manually boosting an item (e..g Post boosted!)
4. Invite to Group (for Post/User-Petition Authors) #383 (e.g. "Invites sent!")
5. Group Manager invites (e.g. "Invites sent!")
6. Creating any leader content (e.g. Poll sent! Event sent! Fundraiser sent! Announcement sent! Discussion sent! Petition Sent!)

[jterps08]

iOS: All Toast Text needs to be centered in the toast Android: Not-yet-tested.