Create Chainable API for Interim Elements

[rschmukler]

Example:

$mdDialog.build()
  .templateUrl('etc')
  .show()

and

$mdDialog.basic()
  .title('Hello World')
  .description('Hello world')
  .ok('Okay')
  .cancel('Forget it')
  .show()

[ThomasBurleson]

Another option is the ability to pass a configuration object .build( config ) that itself has an chainable API.