This reverts commit bf6fad15.

Fix lint in Xcode 7.2, it requires `-destination`

While `watchos` and `tvos` are fairly straightforward, I chose iPhone 4s
as destination for `ios` since it is seems like the most likely to
work with any version of Xcode at this point.

[Project] Change config defines to be prefixed

Update for removal of docset_url attribute

Podfile Refactor