Remove filename from the interface

[honzajavorek]

Current interface counts with filename being passed to dredd-transactions as an argument. I designed a new interface in apiaryio/dredd-transactions#3 where it isn't present as it should be deprecated:

# TO BE DEPRECATED: filename
# filename is used only for compiling to human readeable name in reporters
# and this logic will be moved to Dredd reporters

However, deprecating it isn't such a piece of cake 🍰 we thought with @netmilk, so I'll return the filename back to the interface and I'm filing this issue to have a memory that we want to remove it in the future.

[honzajavorek]

I guess this is blocked until #227 gets finished.

[honzajavorek]

The only (?!) reason why filename is needed:

describe('without sections', () => {
  const filename = 'apiDescription.apib';
  const { mediaType, apiElements } = fixtures('without-sections').apib;
  const compilationResult = compile(mediaType, apiElements, filename);

  it('produces one transaction', () => assert.jsonSchema(compilationResult, createCompilationResultSchema({
    transactions: 1,
  })));

  context('\'origin\'', () => {
    it('uses filename as API name', () => assert.equal(compilationResult.transactions[0].origin.apiName, filename));
    it('uses empty string as resource group name', () => assert.equal(compilationResult.transactions[0].origin.resourceGroupName, ''));
    it('uses URI as resource name', () => assert.equal(compilationResult.transactions[0].origin.resourceName, '/message'));
    it('uses method as action name', () => assert.equal(compilationResult.transactions[0].origin.actionName, 'GET'));
  });
});