=== Refactoring ===
Renamed JsonParser to JsonConverter since it represents better what the
class actually does.
Renamed variables to better represent, what they contain.

=== Assertions ===
Removed unneccesary assertions.
Added missing assertions.

=== Code general ===
Added further Methods so at least the top-level converting is complete.
Finer granularity is still work in progress.

=== Documentation ===
Added and improved documentation.