Bumping AFNetworking to 2.5.x & podspec version to 1.4.2

Current 1.4.1 release can't be used with AFNetworking 2.5 which was released a couple days ago:
```
Update all pods
Analyzing dependencies
[!] Unable to satisfy the following requirements:

- `AFNetworking/NSURLConnection (= 2.5.0)` required by `AFNetworking (2.5.0)`
- `AFNetworking/NSURLConnection (~> 2.4.0)` required by `BDBOAuth1Manager (1.4.1)`
```