Move shebang detection into classifier

Fixes #203

samples/JavaScript/js2.script!

@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+var http = require('http');
+http.createServer(function (req, res) {
+  res.writeHead(200, {'Content-Type': 'text/plain'});
+  res.end('Hello World\n');
+}).listen(1337, '127.0.0.1');
+console.log('Server running at http://127.0.0.1:1337/');

samples/Perl/perl.script!

@@ -0,0 +1,2 @@
+#!/usr/local/bin/perl
+print "Perl\n"

samples/Ruby/ruby2.script!

@@ -1,2 +1,2 @@
 #! /usr/bin/env ruby -w -Ilib:test
-echo "Ruby"
+puts "Ruby"

samples/Shell/bash.script!

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo "bash"

samples/Shell/sh.script!

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "sh"

samples/Shell/zsh.script!

@@ -0,0 +1,2 @@
+#!/bin/zsh
+echo "zsh"

samples/Text/script.foo

@@ -1,2 +0,0 @@
-#!/bin/foo
-???