Acknowledgements View Controller

[ZevEisenberg]

We should wrap the license formatter from #82 into a view controller that can display a list of licenses, and allow tapping to navigate to each individual license. See the BlindWays app for an example. The view controller should pull from the default CocoaPods generated acknowledgements plist, or potentially allow overriding by passing it an [(name: String, license: String)]. It should have a default set of attributes for title and body text, and allow for overriding the list and body text attributes with a standard NSAttributedString attributes dictionary, as well as the background color of the body view, and the background color and separator color of the list cells.