Fix the ajv-keywords "keyword select requires $data option" warning.

[trevorsmith]

Fixes #111.

[the-spyke]

There is another issue:

npm WARN ajv-keywords@2.1.0 requires a peer of ajv@>=5.0.0 but none was installed.

But is package.json I see:

"dependencies": {
    "ajv": "^4.11.4",

[the-spyke]

@trevorsmith Could you try to replace $data: with '$data': and check if build is still failing?

[trevorsmith]

Sorry for the delay, I've been out of town for the weekend.

There are two conflicting linting rules, both of which result in errors:

{ $data: true } // id-match - Identifier '$data' does not match the pattern
{ '$data': true } // quote-props - Unnecessarily quoted property '$data' found

I've added an inline comment to disable id-match.

[trevorsmith]

I've also upgraded ajv to ^5.0.0 after looking over the changelog for any changes that might affect the options schema.