Add initial iPad support
First pass at fixing #13 - crash in NSCache
Improve pad/phone target nav controller handling on Lab VC
Fix "overscroll"of parallax map on iPad
Don't show filter bar by default on iPad
Add "empty detail" view controller for iPad
Xcode project modernization:

* enable recommended warnings plus many others
* treat warnings as errors
* run analyzer on build
* remove landscape support on iPhone
* change target to iOS 7.0
* build for recommended architectures
Organize resources within project
Update gitignore

From https://github.com/github/gitignore/blob/master/Objective-C.gitignore
Add bootstrap script. Remove iRate and ODRefreshControl pods.
Remove iRate and ODRefreshControl from project code
Remove About screen

This will come back later, but I need to focus on other parts
of the UI right now.
Remove unused image
Modernize PCH
Move filter control to nav bar
Remove custom table header view
Tint refresh control
Block assertions in release builds.
Disable warnings for use of GNU language extensions.
Fix implicit sign conversion and precision warnings throughout project
Add a strong self macro to PCH