#1: Added missing trove categories for Python 2 support.
* Clarified which codecs are already part if the standard library and that these codecs overrule the `ebcdic` package. Also added a function `ebcdic.ignored_code_names()` that returns the name of the EBCDIC codecs provided by other means. To obtain access to `ebcdic` codecs overruled by the standard library, use `ebcdic.lookup()`.
* Cleaned up (PEP8, __all__, typos, ...).
Added PEP8 validation and cleaned up remaining issues.