Validating a specific scope does not work as of 2.0.0-beta.15

[logaretm]

Versions:

• VueJs: 2.1.0
• Vee-Validate: 2.0.0-beta.15

Description:

When trying to validate a specific scope using validateAll('scope') it will instead split the string and validate non-existent fields with numeric names:

[vee-validate]: Trying to validate a non-existant field: "0". Use "attach()" first.

Steps To Reproduce:

Create an input group with any scope, then try to run validator.validateAll('scope').

[nikolaynesov]

Also after updating to 2.0.0-beta.15 there is an error:
Uncaught (in promise) TypeError: Cannot read property 'split' of null
that refers to

checks.split('|').forEach(function (rule) {
                var normalizedRule = _this5._normalizeRule(rule, _this5.$fields[name].validations);
                if (!normalizedRule.name) {
                    return;
                }

                if (normalizedRule.name === 'required') {
                    _this5.$fields[name].required = true;
                }

                _this5.$fields[name].validations.push(normalizedRule);
            });

[logaretm]

make sure that the data-attributes are prefixed correctly with 'vv' for example data-vv-rules as they were prefixed as of 2.0.0-beta.15 to prevent conflicts with other plugins.