added properties for getting user name, screen name, and profile image URL of tweets
added properties for getting name, screen name, and profile image URL of users
reformat long lines
initial (very rough) pass at TweetCell
initial (very rough) pass at ComposeViewController
added ComposeViewController to project
reformat long line
moved "Sign Out" bar button item to the left, reformatted long line
set title for TimelineVC
added refreshControl to TimelineVC
register and use TweetCell for TimelineVC
added "New" right bar button item to trigger action to transition to ComposeViewController
quick hack for heightForRowAtIndexPath to get TweetCells to look reasonable for now