Missing license information for some files

I am making a python-ipykernel for Fedora, and it was noticed that some files have no license information, [Review Request: python-ipykernel - IPython Kernel for Jupyter](https://bugzilla.redhat.com/show_bug.cgi?id=1406958).
The files are:
```
ipykernel-4.5.2/ipykernel/__init__.py
ipykernel-4.5.2/ipykernel/_main.py
ipykernel-4.5.2/ipykernel/_version.py
ipykernel-4.5.2/ipykernel/datapub.py
ipykernel-4.5.2/ipykernel/embed.py
ipykernel-4.5.2/ipykernel/ipkernel.py
ipykernel-4.5.2/ipykernel/log.py
ipykernel-4.5.2/ipykernel/comm/__init__.py
ipykernel-4.5.2/ipykernel/inprocess/__init__.py
ipykernel-4.5.2/ipykernel/inprocess/constants.py
ipykernel-4.5.2/ipykernel/inprocess/tests/__init__.py
ipykernel-4.5.2/ipykernel/pylab/__init__.py
ipykernel-4.5.2/ipykernel/tests/test_pickleutil.py
ipykernel-4.5.2/ipykernel/tests/test_start_kernel.py
ipykernel-4.5.2/docs/conf.py
ipykernel-4.5.2/examples/embedding/inprocess_qtconsole.py
ipykernel-4.5.2/examples/embedding/inprocess_terminal.py
ipykernel-4.5.2/examples/embedding/internal_ipkernel.py
ipykernel-4.5.2/examples/embedding/ipkernel_qtapp.py
ipykernel-4.5.2/examples/embedding/ipkernel_wxapp.py
```