Add pass command

http://www.passwordstore.org/

pages/common/pass.md

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+# pass
+
+> safely store and read passwords or other sensitive data easily
+> all data is GPG-encrypted, and managed with a git repository
+
+- initialize the storage using a gpg-id for encryption
+
+`pass init {{gpg_id}}`
+
+- save a new password (prompts you for the value without echoing it)
+
+`pass insert {{path/to/data}}`
+
+- copy a password (first line of the data file) to the clipboard
+
+`pass -c {{path/to/data}}`
+
+- list the whole store tree
+
+`pass`
+
+- generate a new random password with a given length, and copy it to the clipboard
+
+`pass generate -c {{path/to/data}} {{num}}`
+
+- run any git command against the underlying store repository
+
+`pass git {{git-arguments}}`