Add support for Python 3.x
Fix broken import in Python 3.x
Update to support Python 3.x
Merge changes by periodic1236 and lyndsysimon

Conflicts:
	mnemonic/mnemonic.py
	test_mnemonic.py
Fix indentation typo
Merge pull request #14 from lyndsysimon/python3

Fix broken import in Python 3.x