"Directories are not supported" with plugin version 1.2.0

My plugin is configured like this:
```xml
<plugin>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>appengine-maven-plugin</artifactId>
    <version>1.0.0</version>
    <configuration>
        <deploy.version>${app.version}</deploy.version>
        <deploy.project>${app.id}</deploy.project>
        <deploy.promote>False</deploy.promote>
        <deployables>
            <param>target/appengine-staging/app.yaml</param>
            <param>target/appengine-stagine/cron.yaml</param>
        </deployables>
    </configuration>
</plugin>
```

Using the `com.google.cloud.tools:appengine-maven-plugin:deploy` goal the deploy works fine, with the following command:
```
INFORMAZIONI: submitting command: C:\Users\Nicola\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\gcloud.cmd app deploy C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging\app.yaml C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging\cron.yaml --no-promote --version test-deploy --project ape-base --quiet
```

Upgrading the plugin version from `1.0.0` to `1.2.0` (and w/o touching anything else), during the deploy I get this error instead
```
INFORMAZIONI: submitting command: C:\Users\Nicola\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\gcloud.cmd app deploy C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging\app.yaml C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging\cron.yaml C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging --no-promote --version test-deploy --project ape-base

[INFO] GCLOUD: ERROR: Directories are not supported [C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging].  You must provide explicit yaml files.

[INFO] GCLOUD: ERROR: (gcloud.app.deploy) Errors occurred while parsing the App Engine app configuration.
```

Please note the generated command, after the `app.yaml` and `cron.yaml` path, there is an additional 
`C:\Users\Nicola\Noovle\git\ape-core\project\target\appengine-staging` folder



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"Directories are not supported" with plugin version 1.2.0 #144

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"Directories are not supported" with plugin version 1.2.0 #144

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