Hvac-cli

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* version 1.1.0
* description: Hashicorp Vault CLI with additional features
* kv: metadata put does not create empty keys
* kv: user friendly error message when kv metadata get fails
* kv: user friendly error message when kv rollback fails to read
* kv: get needs --from-version instead of --version
* kv: user friendly error message when sys/mounts is not readable

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* version 1.0.6
* kv: make common option function static
* split common options in a static function

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* version 1.0.5
* implement --dry-run
* kv: implement --rewrite-key
* doc: remove redundant toc

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* version 1.0.4
* make the documentation friendly to beginners
* cleanup the documentation to address a formatting error

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* version 1.0.3
* kv: fix typo in undelete
* kv: implement kv rollback
* kv: implement kv destroy
* kv: implement kv patch

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* version 1.0.2
* kv: implement kv delete & kv undelete
* various cosmetic documentation fixes
* kv: implement kv metadata put
* kv: sort entry points
* kv: implement kv metadata get