Move subpackages and modules out of core
Merge branch 'master' into issue-567-for-real-this-time
Remove core subpackage
change imports from skbio.core.* to skbio.*
update .pyx file
Fix setup.py after an overzealous S&R
update generated C code
Update docs to remove core
Add changelog mention
checklist.py only validates API regression against imports defined in __init__.py files

Thanks @ebolyen for the quick fix!
Fix pep8 issues...
Fix some overlines in docstring RST formatting
Merge pull request #571 from jairideout/issue-567-for-real-this-time

Remove skbio.core from import paths