Brooklyn node and cluster upgrade

Merges #266 (cluster upgrade) with work I've been doing on node upgrade.

Builds on #260 so please ensure that is merged first.

Needs further testing (by me at this point) but wanted to push it in case @neykov you have comments, especially on the last commit.
I'd prefer consistency of naming. Should we have `containsLiteralIgnoreCase(String)` here, or should `Strings.containsLiteralIgnoreCase` be renamed to `Strings.containsLiteralCaseInsensitive`?