find_instance: suggest close matches

If no exact match is found for the given instance name, search for
instances with names for which the given name is a prefix, and suggest
these instances.
Update docs generation and add node/cartridge guides
https://trello.com/c/yUMBZ0P9
Merge pull request #48 from kraman/gen_docs

Update docs generation and add node/cartridge guides
Merge pull request #16 from Miciah/find_instance-suggest-close-matches

Merged by openshift-bot
add get detached volumes method