Prepare for release 0.5.4.6

Reflect that this is now the official JPype project (is it?). Include CHANGELOG and AUTHORS in setup.py long_description.

Please have a look at https://testpypi.python.org/pypi/JPype1/0.5.4.6 for a preview how this will look at pypi.

```
$ python setup.py sdist upload -r test
```
works fine. I still have an issue when executing
```
$ python setup.py bdist_wheel upload -r test
In file included from src/native/python/include/jpype_python.h:23:0,
                 from src/native/python/py_hostenv.cpp:17:
src/native/common/include/jpype.h:47:17: fatal error: jni.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
```
Any ideas how to fix it? BTW I got some inspiration reading https://hynek.me/articles/sharing-your-labor-of-love-pypi-quick-and-dirty/