Cleaned up import string and the referenced function calls
cleaned up the exported namespace
Cleaned up import strings, PEP 8 compliance, absolute import compliance, and exposed namespaces
added reference to open issue
PEP 8 cleanup and specified __all__
PEP 8 imports, exposed HelioviewerClient
Moved implementation out if __init__.py, exposed HEKClient to import *
moved code from __init__.py via rename
Cleaned up __init__ so a reasonable public interface is specified.  Fixed a bad reference to vso (rather than vso.attrs) in the test.