Creating Yara rule on the fly from the radare2 session

[radare]

E.g. select block of hex and run some command to make Yara rule, based on that pattern.

(moved from https://github.com/radare/radare2/issues/844)

[cmatthewbrooks]

Not quite exact (uses current function instead of selected block of hex) but I just implemented this in r2kit.

Simple Gist is here.