call pointing::normalize in healpy_pixel_lib

Makes sure that angles are within the allowed limits, see #169
Call pointing::normalize in cython extensions
Remove release script

No longer needed, since releases are done on PyPI via `setup.py sdist`.
Merge pull request #190 from lpsinger/remove_release_sh

Remove release script
Move unit tests into custom test command

Now you can run the unit tests with `python setup.py test`. Setuptools
automatically takes care of temporarily modifying the `PYTHONPATH`. This
will make it easier to run the unit tests in the Debian packaging.
Add unit test for #169, #189
Merge pull request #1 from lpsinger/normalize_pointing

Add unit test for #169, #189
Merge pull request #189 from zonca/normalize_pointing

call pointing::normalize in healpy_pixel_lib
Merge pull request #191 from lpsinger/python_setup.py_test

Move unit tests into custom test command
updated Changelog and version for 1.8.0
moved Leo to core devs