Bind validator scope to `this`

[jrouleau]

Allows users to access the mongoose validate scope from within a custom validator function.

Example:

var mongoose = require("mongoose");
var validate = require("mongoose-validator");

var MySchema = new mongoose.Schema({
  path: {
    type: String,
    validate: [
      validate({
        validator: function (val) {
          if (!this.isModified("path")) {
            return true;
          }
          // ...
        },
        message: "Invalid ..."
      })
    ]
  }
});

[leepowelldev]

Thanks for this. Would you mind adding a test or two and I'll get this merged in.

[leepowelldev]

This has been merged in with the latest patch update