Merge pull request #119 from silversteez/master

Polish stuff
Update README.md
Merge pull request #120 from silversteez/master

Fixed link, add userDonated callback to landing page
add twitter button on app
Merge pull request #121 from tylermcginnis33/master

Add Twitter button on App
Merge branch 'master' of https://github.com/cardsforhumanity/cardsforhumanity
Merge pull request #122 from tylermcginnis33/master

Add Facebook Button
Add facebook button
Merge branch 'master' of https://github.com/cardsforhumanity/cardsforhumanity
Add social media buttons when you're signed in
Merge branch 'master' of https://github.com/cardsforhumanity/cardsforhumanity
Added being signed in to send a link to your friend
Merge pull request #123 from tylermcginnis33/master

Add social media buttons when you're signed in.
Merge branch 'master' of https://github.com/cardsforhumanity/cardsforhumanity
Hiding private link info if you're signed in