Provide the spec's title - similar to mocha's runnable interface

[arnulfojr]

Provide the spec's title - similar to mocha's runnable interface :)

it('test5', function(done) {
    assert.strictEqual('test5', this.spec.title);
    assert.strictEqual('test5', this.spec.fullTitle());
    assert.strictEqual('test5', this.spec.titlePath());
    assert.strictEqual('test5', this.spec.name);
    done();
});

[arnulfojr]

@danielstjules any feedback? :)