Dynamically size the ScrollView in AccountView.

- Create helper method to create contentSize for ScrollView.
- Move all content in view up to fit better.
Load cached Twitter details on app startup.

- Create method to load cached details from disk.
- Rework AppDelegate to load the stored details.
- Change UI for better scrolling in AccountView.
Change AccountView to use Auto Layout.

- Deselect the selected row when transitioning to new view.
- Remove code to set layout with frames.
- Add new method to setup layout constraints.
Set max-width on value label constraints.
Retrieve the original profile picture size.

Twitter by default returns the Profile Image URL with
_normal appended to the end. By removing, _normal, the
original Profile Image (in size) will be returned.

- Remove _normal from the profile image URL.
Add ability to select image in AccountView.

- Create two new buttons, takePicture and usePicture.
- Store UIImage for profile in instance var.
- Add delegate methods to handle UIImagePickerController.
Fix warning for using int instead of NSUInteger.
Save selected image to Twitter Account.

- Create new methods in DownloadProfileManager to send to API.
- Include updates in the AccountView.