Add binds tests.

tests/test_bind.js

+var sqlite = require('../sqlite3_bindings');
+var sys = require('sys');
+assert = require('assert');
+
+var puts = sys.puts;
+var inspect = sys.inspect;
+
+function test_by_index(callback) {
+  db = new sqlite.Database();
+  db.open(":memory:", function () {
+    puts("Opened ok");
+    db.prepare("SELECT ? AS foo, ? AS bar, ? AS baz"
+              , function (error, statement) {
+      if (error) throw error;
+      puts("Prepared ok");
+      statement.bind(1, "hi", function (error) {
+        if (error) throw error;
+        puts("bound ok");
+        statement.bind(2, "there", function (error) {
+          if (error) throw error;
+          puts("bound ok");
+          statement.bind(3, "world", function (error) {
+            if (error) throw error;
+            puts("bound ok");
+            statement.step(function (error, row) {
+              if (error) throw error;
+              assert.deepEqual(row, { foo: 'hi', bar: 'there', baz: 'world' });
+            });
+          });
+        });
+      });
+    });
+  });
+}
+
+function test_num_array(callback) {
+  db = new sqlite.Database();
+  db.open(":memory:", function () {
+    puts("Opened ok");
+    db.prepare("SELECT CAST(? AS INTEGER) AS foo, CAST(? AS INTEGER) AS bar, CAST(? AS INTEGER) AS baz"
+              , function (error, statement) {
+      if (error) throw error;
+      puts("Prepared ok");
+      statement.bindArray([1, 2, 3], function (error) {
+        statement.step(function (error, row) {
+          if (error) throw error;
+          assert.deepEqual(row, { foo: 1, bar: 2, baz: 3 });
+        });
+      });
+    });
+  });
+}
+
+function test_by_array(callback) {
+  db = new sqlite.Database();
+  db.open(":memory:", function () {
+    puts("Opened ok");
+    db.prepare("SELECT ? AS foo, ? AS bar, ? AS baz"
+              , function (error, statement) {
+      if (error) throw error;
+      puts("Prepared ok");
+      statement.bindArray(['hi', 'there', 'world'], function (error) {
+        if (error) throw error;
+        puts("bound ok");
+        statement.step(function (error, row) {
+          assert.deepEqual(row, { foo: 'hi', bar: 'there', baz: 'world' });
+          statement.reset();
+          statement.bindArray([1, 2, null], function (error) {
+            statement.step(function (error, row) {
+              if (error) throw error;
+              assert.deepEqual(row, { foo: 1, bar: 2, baz: null });
+            });
+          });
+        });
+      });
+    });
+  });
+}
+
+test_num_array();
+test_by_index();
+test_by_array();