Remove obsolete _astropy_init.py

Fixes #248.

Author: lpsinger

astropy_healpix/__init__.py

@@ -4,11 +4,10 @@
 BSD-licensed HEALPix for Astropy.
 """
 
-# Packages may add whatever they like to this file, but
-# should keep this content at the top.
-# ----------------------------------------------------------------------------
-from ._astropy_init import *   # noqa
-# ----------------------------------------------------------------------------
-
 from .high_level import *  # noqa
 from .core import *  # noqa
+
+try:
+    from .version import version as __version__
+except ImportError:
+    __version__ = ''

astropy_healpix/_astropy_init.py

@@ -48,14 +48,12 @@ addopts = --doctest-rst
 
 [coverage:run]
 omit =
-    astropy_healpix/_astropy_init*
     astropy_healpix/conftest.py
     astropy_healpix/*setup_package*
     astropy_healpix/tests/*
     astropy_healpix/*/tests/*
     astropy_healpix/extern/*
     astropy_healpix/version*
-    */astropy_healpix/_astropy_init*
     */astropy_healpix/conftest.py
     */astropy_healpix/*setup_package*
     */astropy_healpix/tests/*