Correctly normalize parameters for oAuth authentication

[IchHabRecht]

Currently oAuth authenfication for nested arrays is broken as those information is not decoded like the clients encode the information. Nested array handling is not covered at all. This patch simplifies the normalization handling and processes nested arrays in a proper way. Unfortunately oAuth documentation fails to give some expectations on how to normalize nested array information correctly, so each dimension is sorted on its own.

[IchHabRecht]

Fixes: #31