Clean up node_modules

node_modules/bcrypt-pbkdf/README.md

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-Port of the OpenBSD `bcrypt_pbkdf` function to pure Javascript. `npm`-ified
-version of [Devi Mandiri's port](https://github.com/devi/tmp/blob/master/js/bcrypt_pbkdf.js),
-with some minor performance improvements. The code is copied verbatim (and
-un-styled) from Devi's work.
-
-This product includes software developed by Niels Provos.
-
-## API
-
-### `bcrypt_pbkdf.pbkdf(pass, passlen, salt, saltlen, key, keylen, rounds)`
-
-Derive a cryptographic key of arbitrary length from a given password and salt,
-using the OpenBSD `bcrypt_pbkdf` function. This is a combination of Blowfish and
-SHA-512.
-
-See [this article](http://www.tedunangst.com/flak/post/bcrypt-pbkdf) for
-further information.
-
-Parameters:
-
- * `pass`, a Uint8Array of length `passlen`
- * `passlen`, an integer Number
- * `salt`, a Uint8Array of length `saltlen`
- * `saltlen`, an integer Number
- * `key`, a Uint8Array of length `keylen`, will be filled with output
- * `keylen`, an integer Number
- * `rounds`, an integer Number, number of rounds of the PBKDF to run
-
-### `bcrypt_pbkdf.hash(sha2pass, sha2salt, out)`
-
-Calculate a Blowfish hash, given SHA2-512 output of a password and salt. Used as
-part of the inner round function in the PBKDF.
-
-Parameters:
-
- * `sha2pass`, a Uint8Array of length 64
- * `sha2salt`, a Uint8Array of length 64
- * `out`, a Uint8Array of length 32, will be filled with output
-
-## License
-
-This source form is a 1:1 port from the OpenBSD `blowfish.c` and `bcrypt_pbkdf.c`.
-As a result, it retains the original copyright and license. The two files are
-under slightly different (but compatible) licenses, and are here combined in
-one file. For each of the full license texts see `LICENSE`.