Proposal for removing getMortarScope()

I always hated that each android view has to implement getMortarScope which in turns redelegates to Mortar based on the context.. so I figured a way to remove the need for "getMortarScope()" on views, and replace it with a need for "getContext()", which views conveniently already have.

I wasn't sure about the naming so I kept the old one as `ViewPresenter` and created `ViewPresenter2`. Of course this should change.