Always use API v15 for the location credit request
Fix scanner view when initialized outside of a NIB
Fix crossHairsColor setting
Make constants for permission keynames
Correct dimensions for web link type images
Add support for colorized QR codes

The large corner squares of QR codes will be colored to match the
LevelUp logo. This can be disabled by setting `colorizeCodes` in
`LUGenericQRCodeGenerator` to NO. Also adds properties for setting
output height and width.
Add location name property to order
Version bump: 1.5.3

[Enhancements]
* Constants for permission keynames
* Add support for colorized QR codes
* Add location name property to order

[Bugfixes]
* Correctly initialize scanner view when created outside of a NIB
* Fix crossHairsColor setting
* Use correct dimensions for web link type images
Upgrade AFNetworking to 2.3.1
Version bump: 1.5.4

[Enhancements]
* Upgrade AFNetworking to 2.3.1