safe doesn't have a good way of slurping stdin into a path

[gemzdude]

We need to be able to copy certificate data from lastpass into a vault via safe. The recommended way of doing this is to use lpass show <lastpassid> | safe paste <path>. Unfortunately this results in only the first line of the data being copied into the vault, as safe stops input after the first newline. Either a way to make paste understand the data coming in is more than one line, or making file input operations for safe set grok - for stdin as an argument would be acceptable.