Swizzle internal Parse initializer. Create objects from the network right.
Parse AnyWall original sample (slightly modified).

Modifications:
- Changed property keyToDisplay to modern textKey.
- Put credentials in separate file.
- Use Podfile for Parse dependency.
Modifications to Parse AnyWall sample to use dynamic properties.

- Removed constants in the AppDelegate. Property names constants are now in
  PAWPost under the struct PAWPostAttributes.
- Remove readonly attributes from properties, rename some of them in PAWPost.
- Declare title, subtitle, geopoint and user as @dynamic properties.
- Coordinate is now a simple accessor. Setting the geopoint invoke KVO methods
  for coordinate.
- Commented out the setTitleAndSubtitleOutsideDistance: not interesting to
  show how the category works.
- Substitute every use of generic PFObject for PAWPost, its attributes and its
  accessors in the view controllers.
Update podspec to 0.0.2