Social Share | Share battle result via Twitter

[chhavi]

Background

As per #49 we want to share the awesomeness of playbox with the world! To start with, we need to add social media integration for Facebook and Twitter

Requirements

• Show a Twitter share button along with the battle result message. See https://github.com/kalamuna/playbox/issues/125#issuecomment-173434031
• The tweet should follow the below pattern
  • {winner name} just won an epic battle against {loser name}. Play other battles! {home page URL} #playbox #kalamuna
• Use Twitter API to generate the button: https://dev.twitter.com/web/tweet-button

[chhavi]

[chhavi]

Committed the code. This is how it's looking. Pull request can be seen here #127