mb-9506. Upgrade path changes for 2.0, 2.1, 2.2
minor edits for server nodes REST API
Merge branch 'stage' of https://github.com/couchbaselabs/docs-ng into stage
fixed Hello Couchbase examples
Revised the upgrade path summary for 2.0, 2.1, 2.2 in Installing
Merge pull request #47 from brianshumate/master

fixed Hello Couchbase examples
fix beer name
Merge pull request #48 from brianshumate/master

fix beer name
Merge branch 'master' of https://github.com/couchbaselabs/docs-ng into stage