Created Micropost Controller, with a signed_in_user filter and a create and destroy action.

Created tests to ensure the signed_in_user filter was protecting those actions

Moved the signed_in_user method out of the User Controller and into the Sessions Helper, so that it could be accessed by multiple controllers

Added two micropost routes, create and destroy
Fleshed out the actions in the Micropost controller, including the create and destroy actions and a new filter for the destroy action.

Added some stuff to the home page controller, to allow feeds to pop up there is a user is logged in.

Added several partials, includes _feed, _feed_item, _user_info and _micropost_form, to allow users to see their feed and add microposts...