Async task framework refactoring

Pull Request: https://github.com/zanata/zanata-server/pull/606
This is the new async framework which lays the ground for the CDI version.

Squashed commit of the following:

commit 9fcd562b329130432949a6fd7d72252ec6acf147
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Thu Oct 16 16:29:29 2014 +1000

    Fix transaction missing error when pushing.

commit de8c56e789862af9afa2dc11f782087fd6067ca8
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Tue Oct 14 16:54:07 2014 +1000

    Fix code styling issues.

    Also add some tests.

commit 57bab714e64449b47d37d4017d6ea34a5e26bb3d
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Tue Oct 14 09:36:16 2014 +1000

    Revert arquillian.xml changes.

commit 664fecfe721ffec657df8de45a13385bd0db913c
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Mon Oct 13 16:47:54 2014 +1000

    Replace async package with async2.

    Removed the old package and renamed async2 to the old name.

commit ae1da24cb3f332af3d99cbd71cb6cda815e0afde
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Mon Oct 13 16:04:19 2014 +1000

    Move source and translated doc push to new async framework.

commit 891ae93b40ef47f9f2d9ac5b94ceb7c29719f29b
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Mon Oct 13 13:56:25 2014 +1000

    Migrate Zip File building to the new async framework.

commit 2256c1abfb8b585d7062420c29376c96b62f0840
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Thu Oct 9 16:06:50 2014 +1000

    Migrate Copy Version to the new async framework.

commit 6772a89a0032faf9ca0c1f61c5a0b1eec38ad7f6
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Thu Oct 9 13:41:46 2014 +1000

    Migrate Copy trans to the new async framework.

commit f7123063ab1d00c694cc21c629c5034e896ecc25
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Tue Oct 7 16:17:30 2014 +1000

    Migrate Reindexing to the new Async service.

commit 112bcc1b5a0910c48e21dcea2cb5d5f1f5933ae4
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Tue Oct 7 16:17:09 2014 +1000

    New Asynchronous framework.

    Behaves similarly to what a CDI implementation would.