renamed awsheetcore to core
updated setup.py to 0.0.4
subnet balancing more predictable
added NickNameHelper support private and public ips
private instances are not assigned ips or cnames
can determine if instance is public/private automatically
fix setup.py packages
Merge branch 'master' of https://github.com/adler/awsheet

Conflicts:
	awsheet/helpers/instancehelper.py