fix(command/generate): directive selector should be camelcase

Generating a directive using:

$ ng g directive my-directive

Generates a directive that looks like this:

@Directive({
  selector: 'my-directive',
  providers: [],
  host: {},

})
class MyDirective {}

There are a two things that need a fix IMO:

1. directive selectors should be camelcase, so instead of my-directive I should get myDirective
2. providers and host are not necessarily needed maybe we can simply remove those?
3. If we can’t remove them, then the trailing comma and newline should be at least removed

[Brocco]

If you want you can play with the branch I’m working on should have the full PR ready in the next few days

https://github.com/Brocco/angular-cli/tree/style-guide

[johnpapa]

good question … not sure. mySillyDirectiveName would be ideal … but I think it is very reasonable to make it mySiLyDiRECTiveName