build tags?

I separate different kinds of tests using build tags, eg:

```go
// +build functional

package main

import (
"fmt"
"github.com/DATA-DOG/godog"
)
...
func FeatureContext(s *godog.Suite) {
s.Step(`^there are (\d+) godogs$`, thereAreGodogs)
s.Step(`^I eat (\d+)$`, iEat)
s.Step(`^there should be (\d+) remaining$`, thereShouldBeRemaining)

s.BeforeScenario(func(interface{}) {
Godogs = 0 // clean the state before every scenario
})
}
...
```

when I run godog without args, it cannot find the context initializer. Is there any way to make this work with godog?

Reproduce the reported behavior using the functional build-tag example and a no-argument godog run. Start by tracing how godog locates the context initializer; done means establishing whether this build-tagged setup works, or clearly documenting the supported behavior.

Written by the indexing model from the issue text.