Add item list TextView.  Change fragment to display ListView within FrameLayout.  Optimize imports and statements in MainActivity.
Finish Lesson 1.

Add dummy weather data.  Add ArrayAdapter and set the listview to use it.
rename PlaceholderFragment
extract ForecastFragmen into its own class.  copy+paste network code from https://gist.github.com/anonymous/6b306e1f6a21b3718fa4
improvements to network code
change menu item to refresh.  add translatable=false to strings xml so that translation services will skip over this string