Minor refactorings to wallpaper deleter
Rename resource getter in prep for addition of JSOUP refactor
Add Bing html resource getter back to project

Since Bing API requires a developer key, this project is not feasible
to distribute unless it is available to users without said dev key. As
such, I am re-adding the implementation for parsing the html
obtained via a request to the bing search that requires no
authorization.