Add support for cassandra.replace_address

This method was added in CASSANDRA-5916 for replacing a node
by address.  replace_address also replaces replace_node and
replace_token.
Merge remote-tracking branch 'pcmanus/master' into add-replace-address-support

Conflicts:
	ccmlib/node.py
Merge pull request #85 from thobbs/add-replace-address-support

Add support for cassandra.replace_address