Handle empty result in stopsNearby call

The call will now return an empty list when there are no results returned.
#1

Renamed error class names

v0.3.5

Renamed error classes

Custom exceptions

v0.3.4

Custom error classes

Added method documentation + bug fix - v0.3.3

Added method documentation and fixed a bug.

Minor fixes, better error handling - v0.3.2

Better error handling

Added methods for all available API calls

This release contains methods for all API calls:

• location
• trip
• departureBoard
• multiDepartureBoard
• stopsNearby

Minor fixes - v0.2

Remove some comments and fix a link

Initial release - v0.1

First version