add pointer to USENIX paper/presentation + ports cleanup.

Author: lowe

README.md

@@ -18,30 +18,28 @@ Consider using zxcvbn as an algorithmic alternative to password composition poli
 * __More flexible__: zxcvbn allows many password styles to flourish so long as it detects sufficient complexity — passphrases are rated highly given enough uncommon words, keyboard patterns are ranked based on length and number of turns, and capitalization adds more complexity when it's unpredictaBle.
 * __More usable__: zxcvbn is designed to power simple, rule-free interfaces that give instant feedback. In addition to strength estimation, zxcvbn includes minimal, targeted verbal feedback that can help guide users towards less guessable passwords.
 
+For further detail and motivation, please refer to the USENIX Security '16 [paper and presentation](https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/wheeler).
+
 At Dropbox we use zxcvbn ([Release notes](https://github.com/dropbox/zxcvbn/releases)) on our web, desktop, iOS and Android clients. If JavaScript doesn't work for you, others have graciously ported the library to these languages:
 
-* [`zxcvbn-c`](https://github.com/tsyrogit/zxcvbn-c) (C/C++)
-* [`zxcvbn-cpp`](https://github.com/rianhunter/zxcvbn-cpp) (C/C++/Python/JS)
-* [`nbvcxz`](https://github.com/GoSimpleLLC/nbvcxz) (Java)
-* [`zxcvbn4j`](https://github.com/nulab/zxcvbn4j) (Java)
-* [`zxcvbn-ios`](https://github.com/dropbox/zxcvbn-ios) (Objective-C)
 * [`zxcvbn-python`](https://github.com/dwolfhub/zxcvbn-python) (Python)
+* [`zxcvbn-cpp`](https://github.com/rianhunter/zxcvbn-cpp) (C/C++/Python/JS)
+* [`zxcvbn-c`](https://github.com/tsyrogit/zxcvbn-c) (C/C++)
+* [`zxcvbn-rs`](https://github.com/shssoichiro/zxcvbn-rs) (Rust)
 * [`zxcvbn-go`](https://github.com/nbutton23/zxcvbn-go) (Go)
+* [`zxcvbn4j`](https://github.com/nulab/zxcvbn4j) (Java)
+* [`nbvcxz`](https://github.com/GoSimpleLLC/nbvcxz) (Java)
 * [`zxcvbn-ruby`](https://github.com/envato/zxcvbn-ruby) (Ruby)
 * [`zxcvbn-js`](https://github.com/bitzesty/zxcvbn-js) (Ruby [via ExecJS])
-* [`zxcvbn-php`](https://github.com/bjeavons/zxcvbn-php) (PHP)
+* [`zxcvbn-ios`](https://github.com/dropbox/zxcvbn-ios) (Objective-C)
 * [`zxcvbn-cs`](https://github.com/mickford/zxcvbn-cs) (C#/.NET)
 * [`szxcvbn`](https://github.com/tekul/szxcvbn) (Scala)
+* [`zxcvbn-php`](https://github.com/bjeavons/zxcvbn-php) (PHP)
 * [`zxcvbn-api`](https://github.com/wcjr/zxcvbn-api) (REST)
-* [`zxcvbn-rs`](https://github.com/shssoichiro/zxcvbn-rs) (Rust)
 
 Integrations with other frameworks:
 * [`angular-zxcvbn`](https://github.com/ghostbar/angular-zxcvbn) (AngularJS)
 
-For more motivation, see:
-
-http://tech.dropbox.com/?p=165
-
 # Installation
 
 zxcvbn detects and supports CommonJS (node, browserify) and AMD (RequireJS). In the absence of those, it adds a single function `zxcvbn()` to the global namespace.