export-name does not work with kebab/snake case

[michaelw85]

Bug Report

• tslint-microsoft-contrib version: 6.0.0
• TSLint version: 5.12.1
• TypeScript version: 3.3.1
• Running TSLint via: CLI / VSCode

TypeScript code being linted

// my-component.ts || my_component.ts
export class MyComponent {
//...
}

with tslint.json configuration:

{ "export-name": true }

Actual behavior

The exported module or identifier name must match the file name. Found: my-component.ts and MyComponent tslint(export-name)

Expected behavior

✅ Linter should pass

Additional request

It would also be nice to be able to accept export names where the file name matches the first part.
e.g:

// file: src/generators/unit-test.ts
export class UnitTestGenerator {}

Related to #450