New 'resolve' option for defining locals for Dialog controller

[rur]

See: Need resolves with the controller. #85

Allow users to define DI factories for dialog controller locals. I have emulated the specification and implementation of the angular-route $routeProvider 'resolve' option. Hence it supports async values via promises.

This feature is purely an enhancement, so it should not change or break the existing API in any way. To gain some confidence about this I have also added a basic testing setup to the project (karma + jasmine). This includes some rudimentary specs but is not comprehensive by any measure.

Here are what the docs look like for the feature:

resolve {Object.<string, function>=}

An optional map of dependencies which should be injected into the controller.
If any of these dependencies are promises, ngDialog will wait for them all to be resolved
or one to be rejected before the controller is instantiated.

If all the promises are resolved successfully, the values of the resolved promises are
injected.

The map object
is:

• key – {string}: a name of a dependency to be injected into the controller.
• factory - {string|function}: If string then it is an alias for a service.
  Otherwise if function, then it is injected using $injector.invoke and the return
  value is treated as the dependency. If the result is a promise, it is resolved
  before its value is injected into the controller.

ngDialog.open({
    controller: function Ctrl(dep) {/*...*/},
    resolve: {
        dep: function depFactory() {
            return 'dep value';
        }
    }
});

[voronianski]

@rur please rebase with latest master to have ability to merge this.

[rur]

@voronianski ok, I'll do that in work on Monday. Are you comfortable with the test setup I have added?

[rur]

Ok pull request is ready to be merged.