Commits on Feb 20, 2017

1. Improve error messages and recovery suggestions …

   Resolves #35 `Improve Error Explanation for Rate Limit`.
   
   - Adds checks for rate limiting and uses new, specific error
   - Refactors response validation to static methods in an extension of
   `ResponseHandler`, thus providing a default implementation to all
   response handlers
   - Refactors the deserialisation of JSON in `JSONResponseHandler` into a
   separate method to improve readability
   - Updates `GitHubScannerProtocolError` to inherit from `LocalizedError`
   and provides a default implementation for `CustomStringConvertible`
   - Adds `errorDescription` and `recoverySuggestion` to all error types
   - Moves `NetworkError` and `ScanOptionsError` into own files
   - Expands test suite for error handling
   - Refactors accessing the `HTTPURLResponse` next link header into an
   extension property to improve readability of `JSONResponseHandler` and
   to help maintain single responsibility principle

   Aaron McTavish committed Feb 20, 2017
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2. Fix indendentation of if statement …

   Per code review by @arnau

   Aaron McTavish committed Feb 20, 2017
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