Use `source /dev/stdin` to execute commands

Let's say there's a command in a file, like a README file, and you don't have any copy or paste tools handy. You can get the command out of the README file with:

> cat README.md | grep "^sed"
sed -ie "s/\(.*\)/Plug '\1'/" .vimbundle.local

Great! Now how do we run it? The source is generally used to read and execute commands in files, and really /dev/stdin behaves like a file.

You can use the pipe operator to place the command into stdin and then source will read from stdin.

> cat README.md | grep "^sed" | source /dev/stdin

A simpler example can be constructed with echoing

> echo "echo 'hi there'"
echo 'hi there'

And

> echo "echo 'hi there'" | source /dev/stdin
hi there

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