Updated changelog

Updated changelog with new features in 0.4.0
Removed Downloadtip Call

Removed code to add Downloadtip elements to <head>
Removed Downloadtip assets

Removed JS and CSS assets for Downloadtip (will be added back in a
future release).
Updated screenshot 1

Updated screenshot 1 to reflect new options available on the Settings
page.
Merge pull request #6 from cconover/dev

Additions to 0.4.0