Update README.md
added ds_store to .gitignore
Merge branch 'master' of https://github.com/Neo4JTweetUp/tweetUpServer
Delete .DS_Store
deleted .DS_Store
Merge branch 'master' of https://github.com/Neo4JTweetUp/tweetUpServer
Merge branch 'sandbox' of https://github.com/Neo4JTweetUp/tweetUpServer
started implementing unit tests
added commonFriendsArray helper method
fixed merge conflict