Change the accepted address versions

Update _verifyAddress to accept version 4.
Merge branch 'fixApi'
_verifyAddress support v4 addresses
Merge pull request #508 from Atheros1/master

_verifyAddress support v4 addresses
Add api method decodeAddress

Add decodeAddress as an api call. Like the addresses.decodeAddress function
it return status, addressVersion, streamNumber, and ripe. ripe is base64
encoded.
Merge branch 'decodeAddress2'

Conflicts:
	src/bitmessagemain.py
update address versions in addChan